KR20070060679A - Sheet for absorbing impact and sealing - Google Patents

Abstract

An impact absorbing and sealing sheet is provided to effectively absorb impact and to seal electronic devices by having good mechanical property and adhesion power and to easily apply to an automation process. The impact absorbing and sealing sheet(10) is formed by stacking an adhesive layer(2), a polyurethane layer(4), and a surface coating layer(6) in order. The sheet has the thickness of 106~2120 micron meters, tensile strength of 50~500kgf/cm^2, elongation percentage of 100~600, and shore A hardness of 25~80. The adhesive layer is made of at least one selected from a group comprising vinyl acetate, methyl methacrylate, acetoacetate acrylate, and sulfonated polystyrene. The adhesive layer has the peel strength of at least 150gr/cm and thickness of 5~100 micron meters.

Description

Shock Absorbing and Sealing Sheets {SHEET FOR ABSORBING IMPACT AND SEALING}

1 is a cross-sectional view of the shock absorbing and sealing sheet according to an embodiment of the present invention,

2 is a cross-sectional view of the shock absorbing and sealing sheet according to another embodiment of the present invention,

Figure 3 is a schematic diagram showing the manufacturing process of the shock absorbing and sealing sheet according to the present invention,

Figure 4 is a view showing the shape of the winding roll of the shock absorbing and sealing sheet according to the present invention, where A is an enlarged cross-sectional view of the sheet,

FIG. 5 is a view illustrating a state in which a sheet for impact absorption and sealing in the form of a winding roll of FIG. 4 is cut.

[Industrial use]

The present invention relates to a shock absorbing and sealing sheet, and more particularly, it is introduced into the interior and exterior of various electronic devices to prevent damage to components due to external impact, and to prevent contamination such as dust from being introduced from the outside. It relates to a shock absorbing and sealing sheet that can be.

[Prior art]

Electronic devices such as mobile phones, hard disk drives (HDDs), televisions and liquid crystal displays are made up of precise mechanical components and electronic devices. The electronic devices easily fail or break when a physical shock is applied from the outside. In addition, contaminants such as dust introduced from the outside may interfere with the air flow in the electronic device, causing overheating of the electronic device, thereby reducing the life of the electronic device.

In order to solve these problems, in general, electronic devices are provided with a sheet that acts as a sealing agent to absorb shocks from the outside and close the gap of the exterior.

For example, Korean Patent Laid-Open Publication No. 2002-0015239 prevents optical sheets from being damaged or wrinkled by a guide panel of a liquid crystal display device, maintains a gap between the panel guide and the light guide plate, and maintains a gap between them. It mentions the installation of a separate space keeping / heat blocking member to block the inflow of foreign substances. In this case, a pad made of silicon is used as the gap maintaining / heat blocking member.

In addition, Korean Laid-Open Patent Publication No. 2005-0058055 discloses forming a separate elastic layer between substrates in order to prevent gravity failure of the liquid crystal display device. In this case, the elastic layer is prepared by preparing a paste containing an aromatic diisocyanate, polyol and 1,4-butanediol, coating on a substrate, and then curing to form a polyurethane rubber layer.

The gap retaining / heat-blocking member or elastic layer formed in the above-described Patent Publication Nos. 2002-0015239 and 2005-0058055 use silicone or polyurethane rubber, respectively, to provide elastic and high sealing effect to home appliances and electronics. Granted.

However, in order to form an elastic layer as described in Korean Patent Laid-Open Publication No. 2005-0058055, after preparing the elastic layer composition in the form of a paste, there is a process inconvenience in that coating must be performed according to a pattern.

On the other hand, the silicon pad disclosed in Korean Laid-Open Patent Publication No. 2002-0015239 has an advantage of being manufactured in a sheet form and very easily applicable to various home appliances and electronic devices.

Sheets such as silicone pads are used by attaching a double-sided adhesive tape to one side of the pad, or by attaching an acrylic pressure-sensitive adhesive to one side of the pad and then attaching to the electronic device. However, in the case of the silicon sheet, since the surface tension of the silicon itself used as a raw material of the pad is low and the adhesive force to the adhesive tape or the adhesive is low, a problem arises that the silicon sheet is easily peeled off after being attached to the electronic device.

In order to solve this problem, a method of coating a separate primer on a silicon pad has been proposed. Although satisfactory adhesion can be obtained through the above method, the addition of a separate primer coating process complicates the process, increases manufacturing costs, and raises the environmental pollution problem due to the organic solvent contained in the primer coating composition.

The method of using silicone as the material of the adhesive or the adhesive tape has been proposed as a method for increasing the adhesive force between the silicone and the adhesive without using a primer. However, this method not only lowers the adhesion but also raises the price.

In addition, a sheet made of polyvinyl chloride (PVC) has been proposed to replace silicon. However, in the case of the PVC, the resin itself is excessively high in hardness to use a large amount of plasticizer to have elasticity and sealing properties. These plasticizers are transferred to the surface of the electronic device over time, thereby contaminating the interior and parts of the electronic device, causing a malfunction of the device and shortening the lifespan.

In addition, in the case of the silicone sheet, a pressure-sensitive adhesive tape or an adhesive tape is attached to the silicone pad, and the adhesion process is mainly performed by applying pressure by hand, which is a factor that greatly reduces the production speed in the continuous automation process. have.

Therefore, there is a need for development of a sheet having excellent adhesive strength without the use of a separate primer, easy introduction into an automated process, dispersing an impact applied from the outside, and excellent sealing effect.

In order to solve the above problems, an object of the present invention is to provide a shock absorbing and sealing sheet having the same or more physical properties to replace the conventional silicon pad, low cost, can be easily introduced into the automated process To provide.

In addition, another object of the present invention is to provide a shock absorbing and sealing sheet that can be introduced into the interior and exterior of various electronic devices to prevent damage to the components due to external impact, and to prevent the introduction of pollutants such as dust from the outside To provide.

In order to achieve the above object, the present invention

Provided is a shock absorbing and sealing sheet in which an adhesive layer, a polyurethane layer, and a surface coating layer are sequentially stacked.

Shock absorbing and sealing sheet according to the present invention has a thickness of 106 to 2120 ㎛, tensile strength of 50 to 500 kgf / ㎠, elongation 100 to 600%, Shore A hardness (Shore A hardness) of 25 to 80.

In addition, the shock absorbing and sealing sheet may further include an adhesive auxiliary layer for improving adhesiveness between the polyurethane layer and the adhesive layer.

Hereinafter, the present invention will be described in detail with reference to FIGS. 1 to 5.

The shock absorbing and sealing sheet of the present invention has physical properties equivalent to or higher than those of a conventional silicon sheet, is inexpensive, and can be easily introduced into an automated process. In addition, the sheet of the present invention is characterized in that it is introduced into the interior and exterior of various electronic devices to prevent damage to the components due to external impact, and to prevent the inflow of pollutants such as dust from the outside.

1 is a cross-sectional view of the shock absorbing and sealing sheet according to an embodiment of the present invention.

Referring to FIG. 1, the shock absorbing and sealing sheet 10 has a structure in which an adhesive layer 2, a polyurethane layer 4, and a surface coating layer 6 are sequentially stacked.

The adhesive layer 2 included in the sheet 10 of the present invention provides adhesiveness to the sheet so that the sheet can be attached to the interior and exterior of the electronic device.

The pressure-sensitive adhesive layer 2 can be prepared using a pressure-sensitive adhesive composition commonly used in this field, and is not particularly limited in the present invention. Representative examples thereof include acrylic monomers, acrylic oligomers, acrylic polymers, acetate polymers, and styrene polymers. Preferably, vinylacetate, methylmethacrylic acid, ethylacetoacrylate, and sulfonated polystyrene are used. It is preferable to select and produce more than one type.

At this time, the adhesive layer 2 should have a physical property that the sheet 10 can be attached to the electronic device with sufficient adhesive strength.

That is, the peel strength of the adhesive layer 2 is preferably at least 150 gr / cm in order to prevent the sheet 10 from being released from its original position during the assembling and use of the product.

In addition, the thickness of the adhesive layer (2) can be adjusted according to the adhesive properties of the material, but in order to maintain a minimum adhesive force is preferably 5 ㎛ or more, in order to prevent the sheet 10 is too thick is 100 ㎛ or less It is preferable.

The adhesive layer 2 of the sheet 10 according to the present invention is formed directly on the polyurethane layer 4 to be described later, or made by laminating after the production in the form of a separate film. In the case of forming directly, conventional methods such as a screen printing method, a spray coating method or a coating method using a doctor blade may be used depending on the viscosity of the adhesive composition. In addition, formation by lamination is performed by forming the adhesion layer 2 by the above application | coating or spraying on another film, and laminating | stacking with the polyurethane layer 4, and removing a film.

In particular, the polyurethane layer 4 is a layer which is a feature of the present invention, and exhibits various advantages as compared with the conventional silicon-based material. Specifically, the polyurethane layer 4 is a sealing to directly absorb and disperse the impact applied from the outside when installing the sheet 10 in the interior and exterior of the electronic device to protect the electronic device, and to suppress the influx of external pollutants It's my job.

As the material of the polyurethane layer 4, a soft polyurethane, a semi-hard polyurethane or a hard polyurethane can be used, and among these, a soft polyurethane is most preferable. Specifically, the polyurethane layer 4 includes methylene diphenyl isocyanate (MDI), toluene diisocyanate (TDI), methylene diphenyl isocyanate (MDI) oligomer, toluene diisocyanate (TDI) oligomer, and carbodiimide modified methylene diisocyanate It can be prepared by reacting at least one diisocyanate selected from the group consisting of, and at least one polyol selected from the group consisting of 1,4-butanediol, polypropylene glycol, polytetramethylene glycol, and polyethylene glycol.

In addition, a crosslinking agent may be additionally used to increase the crosslinking reaction rate of the diisocyanate and the polyol and to allow sufficient crosslinking to occur, wherein the content thereof is 0 to 100 parts by weight based on 100 parts by weight of the prepolymer (diisocyanate + polyol). use.

The crosslinking agent may be a conventional one, but is not limited in the present invention, preferably trimethylolpropane, triethanolamine, pentaerythritol, toluenediamine, toluene diamine, ethylenediamine (ethylenediamine), glycerine, oxypropylated ethylene diamine, hexamethylene diamine, m-phenylene diamine, diethanolamine and triethanolamine (triethanolamine) can be used a compound selected from the group consisting of.

The polyurethane layer 4 preferably has a Shore A hardness of 25 or more in order to prevent the mechanical properties from being excessively degraded, and has sufficient impact while preventing excessively strong force from being applied to the electronic device during assembly. It is preferable that Shore A hardness is 80 or less in order to exhibit absorption performance.

In addition, for the same reason as the hardness range, the polyurethane layer 4 preferably has a tensile strength of 50 to 500 kgf / cm 2.

In addition, the polyurethane layer (4) is preferably installed in the product to prevent the permanent deformation of the sheet 10 after a long period of time, the permanent compression ratio is preferably 0.1 to 20%, can be adhered to the electronic device sufficiently close In order to ensure that the elongation is preferably from 100 to 600%.

At this time, the thickness of the polyurethane layer 4 may vary depending on the applied electronic device, but in order to maintain a minimum shock absorption effect is preferably at least 0.1 mm, and maintains the sealing effect even on the surface of the uneven electronic device, It is preferable that it is 2.0 mm or less in order to be able to make light and thin the electronic device.

Polyurethane layer (4) according to the invention is produced in the form of a sheet, a method for processing extrusion, injection molding, calendering, inflation, or casting commonly used in this field It can be prepared by.

In one example, the polyurethane layer 4 is produced by a casting process by a two-component mixing process. In the two-component mixing process, at least one polyol selected from the group consisting of polypropylene glycol, polytetramethylene glycol, and polyethylene glycol, methylene diphenyl isocyanate, toluene diisocyanate, and methylene diphenyl isocyanate oligomer, toluene diisocyanate oligomer, And at least one diisocyanate prepolymer selected from the group consisting of carbodiimide-modified methylene diisocyanate as the main raw material.

The raw material may be injected into a mold after being weighed and mixed in a batch or continuous method, or coated on a base film to cure to form a polyurethane layer 4.

When using such a casting method, there is no solvent or volatile substance, there is an advantage that can be made by a single product of a certain thickness. In addition, since the polyurethane layer 4 manufactured by the casting process has a three-dimensional network structure, it is possible to secure low tensile strength and sufficient tensile strength at the same time without using an additive such as a plasticizer, and to continuously apply the casting process. Thereby, it is possible to mass-produce the sheet 10 which concerns on this invention in roll form.

Meanwhile, the surface coating layer 6 included in the sheet 10 of the present invention is formed on the polyurethane layer 4 and is positioned on the outermost portion of the sheet 10 to prevent contaminants from entering the electronic device. In addition to the role of the sealant, to protect the surface of the sheet 10 and to give a proper frictional resistance to the sheet surface to enable the production in roll form.

The material of the surface coating layer 6 may be a coating material commonly used in this field, and is not particularly limited in the present invention. As a representative example, the surface coating layer 6 may include an acrylic polymer prepared from an acrylic monomer or oligomer including silicon acrylate, silicon methacrylate, acrylic acid, methacrylic acid, methyl methacrylate, and methyl methacrylate; Urethane-acrylate copolymers or blends; Or a vinyl-based polymer comprising polyethylene, polypropylene, polyvinylidene fluoride, and teflon.

In this case, the surface coating layer 6 preferably has a peel strength of at least 50 gr / cm in order to prevent peeling from the polyurethane layer 4.

In addition, when the sheet 10 of the present invention is manually assembled to an electronic device, the surface coating layer 6 has friction measured against the glass so that a uniform and constant force is applied to the surface of the sheet 10. It is preferable that the coefficient is 2-20.

The thickness of the surface coating layer 6 can be adjusted according to the properties of the material, and in order to prevent the appearance of the sheet 10 from deteriorating and to maintain a uniform coefficient of friction, the thickness is preferably 0.5 μm or more, It is preferable that it is 10 micrometers or less in order to prevent generation.

The surface coating layer 6 according to the present invention is formed directly on the polyurethane layer 4 as in the adhesive layer, or made of a separate film and then laminated.

In the case of forming directly, conventional methods such as a screen printing method, a spray coating method or a coating method using a doctor blade may be used depending on the viscosity of the surface coating composition. In addition, the formation by lamination is performed by forming a surface coating layer by coating or spraying as described above on a separate release film, then laminating with the polyurethane layer 4 to remove the release film.

Such a shock-absorbing and sealing sheet 10 of the present invention is composed of a pressure-sensitive adhesive layer (2), a polyurethane layer (4) and a surface coating layer (6) can be introduced into various electronic devices. In this case, the sheet 10 may further include a separate additional layer as needed, and preferably further include an adhesive auxiliary layer 8 between the adhesive layer 2 and the polyurethane layer 4. .

2 is a cross-sectional view of the shock absorbing and sealing sheet 20 according to another embodiment of the present invention.

Referring to FIG. 2, the shock absorbing and sealing sheet 20 of the present invention includes an adhesive layer 2, an adhesive auxiliary layer 8, a polyurethane layer 4, and a surface coating layer 6. At this time, the adhesive layer 2, the polyurethane layer 4 and the surface coating layer 6 is as described above.

In addition, the adhesive auxiliary layer 8 is a layer which can be added to give more stable adhesive force to the sheet 20, and is made of a composition having excellent compatibility with the materials of the polyurethane layer 4 and the adhesive layer 2. .

Specifically, at least one adhesive auxiliary layer 8 is selected from the group consisting of urethane acrylate having a vinyl group introduced into the terminal of a low molecular weight oligourethane, a copolymer of urethane acrylate and an acrylic monomer, and a mixture of urethane and acrylic. It is preferable to manufacture by.

In addition, it is preferable that the adhesion auxiliary layer 8 is formed to a thickness of 0.5 to 10 μm, and the peel strength to the polyurethane layer 4 is preferably at least 300 gr / cm.

The shock absorbing and sealing sheet of the present invention including the above configuration has a thickness of 106 to 2120 μm, a tensile strength of 50 to 500 kgf / cm 2, an elongation of 100 to 600%, and Shore A hardness (Shore A hardness) has a physical property of 25 to 80.

That is, since the sheet according to the present invention is most influenced by the physical properties of the polyurethane layer 4, it is possible to obtain the desired physical properties of the entire sheet by adjusting the physical properties of the polyurethane layer (4).

Specifically, the sheet according to the present invention may vary in thickness depending on the electronic device to be applied, but in order to maintain a minimum shock absorption effect, the thickness is preferably 106 μm or more, and is also sealed on the surface of the uneven electronic device. It is preferable that the thickness is 2120 µm or less in order to maintain the effect and to make the electronic device light and small.

Further, the sheet according to the present invention preferably has a tensile strength of 50 kgf / cm 2 or more in order to prevent the mechanical properties from being excessively degraded, and has sufficient shock absorption performance while preventing excessively strong force from being applied to the electronic device during assembly. It is preferable that the tensile strength is 500 kgf / cm 2 or less in order to be shown.

In addition, the sheet according to the present invention is preferably 100 to 600% elongation in order to be adhered to the electronic device sufficiently close.

In addition, the sheet 10 according to the present invention preferably has a Shore A hardness of 25 or more in order to prevent the mechanical properties from being excessively lowered, and prevents excessively strong force from being applied to the electronic device during assembly. It is preferable that Shore A hardness be 80 or less in order to exhibit sufficient shock absorption performance.

On the other hand, the production of a shock absorbing and sealing sheet according to the present invention can be applied to a conventional sheet manufacturing process. That is, a polyurethane layer is prepared using a raw material of polyurethane, a surface coating composition is coated on the polyurethane layer to form a surface coating layer, and an adhesive layer is formed on the other side of the polyurethane layer on which the surface coating layer is not formed. Form and manufacture.

In particular, the sheet according to the present invention, by using a polyurethane composition, the sheet can be produced in an automated process, the process of assembling the sheet in an electronic device can also be automated to increase the overall production speed.

Figure 3 is a schematic diagram showing the automated manufacturing process of the shock absorbing and sealing sheet according to the present invention.

Referring to FIG. 3, in S1, the raw materials are mixed in a raw material supply apparatus including a polyol, a diisocyanate, a prepolymer, or the like, which is a raw material of the polyurethane layer 4, and then coated on a coating roll with a predetermined thickness, 30 to 150. It hardens at the temperature of ° C, and forms the polyurethane layer 4 in the form of a pad.

In S2 is applied to the surface coating composition on the polyurethane layer of the pad form prepared in S1, and then cured to form the surface coating layer (6). At this time, the curing method depends on the surface coating composition used, in the case of thermal curing, an oven of sufficient length is installed, and in the case of light curing, a lamp for irradiating UV is installed.

In S3, the adhesive auxiliary layer 8 is applied and cured on the other side of the polyurethane layer 4 in which the surface coating layer 6 is not formed in S2.

In S4, the adhesion layer 2 is formed on the adhesion auxiliary layer 8 apply-hardened in S3. At this time, the formation of the pressure-sensitive adhesive layer by wet coating is achieved by spraying or applying the pressure-sensitive adhesive coating composition to the pressure-sensitive adhesive layer and drying. In addition, in the formation of the adhesive layer by lamination, the film having the adhesive layer formed on the other side of the polyurethane layer on which the surface coating layer is not formed is laminated with a pressing roll.

In S5, the sheet produced in S4 is wound in a roll state, and the winding roll is cut into an appropriate width using a slitting device.

4 is a schematic view showing the winding rolls manufactured through the S1 to S5, it can be seen that the surface coating layer 6, the polyurethane layer 4, the adhesive auxiliary layer 8 and the adhesive layer (2) is formed. In addition, Figure 5 shows the finished product in a state of cutting the take-up roll.

Hereinafter, preferred examples and comparative examples are presented to aid in understanding the present invention. However, the following examples are only for illustrating the present invention, and the present invention is not limited thereto.

[ Example ]

100 parts by weight of polypropylene glycol (BASF, trade name LUPRANOL L1100, molecular weight 1,100) and 600 parts by weight of methylene diphenyl diisocyanate (TCI) were stirred under a nitrogen atmosphere at 80 ° C. for 4 hours to prepare a prepolymer.

220 parts by weight of polypropylene glycol (BASF, trade name LUPRANOL L1100, molecular weight 1,100), 620 parts by weight of polypropylene glycol (BASF company, trade name LUPRANOL L2030, molecular weight 3,100), 1,4-butanediol (1,4-Butanediol) (Acros G) 90 parts by weight, and 0.3 parts by weight of a dibutyl tin dilaurate (Air product, trade name T-12,) as a catalyst were added thereto, and stirred at 50 ° C. for 4 hours under reduced pressure to obtain a polyol mixture.

90 parts by weight of the prepolymer was added to 100 parts by weight of the polyol mixture, stirred at 25 ° C. for 10 seconds, and then coated on a release paper and cured at 90 ° C. for 6 hours to prepare a polyurethane layer having a thickness of 1 mm.

Subsequently, after applying a mixed solution containing 100 parts by weight of urethane acrylate (Sartome, trade name CN962) and 3 parts by weight of silica (Fuji-Silysia, trade name Silisya SY-161) on the polyurethane layer, UV curing was performed. A 2 μm thick surface coating layer was formed. The coefficient of friction of the surface coating layer according to ASTM D 1894 was determined to be 9.

Next, an acrylic double-sided adhesive tape [Three (3M), trade name EAD 217] having a peel strength of 450 gf / cm and a thickness of 70 μm was laminated on the other side of the polyurethane layer on which the surface coating layer was not formed. The sealing sheet was manufactured.

[ Comparative example ]

Silicone rubber (trade name Silastic CF 201U, Dow Corning) was processed by a calendering method, molded into a pad having a thickness of 1.0 mm, and then cured at 200 ° C. for 4 hours. An acrylic double-sided adhesive tape [3M (3M), trade name EAD 217] having a thickness of 70 µm was laminated on the obtained silicon pad.

[ Experimental Example ]

For the sheets prepared through Examples and Comparative Examples, tensile strength, elongation rate, Shore A hardness and peel strength were measured as follows, and the results are shown in Table 2 below.

Experimental Example  One: The tensile strength

Samples cut to a width of 20 mm and a length of 130 mm were left for 24 hours at 23 ° C. and 50% RH, and then tensioned using an Instron Universal Testing Machine according to ASTM D 3574. Tensile strength was measured at a speed of 500 mm / min.

Experimental Example  2: Elongation

After leaving the sample at 23 ° C. and 50% RH for 24 hours, the elongation at the point where the specimen was cut was measured according to ASTM D 3574.

Experimental Example  3: Shore  A hardness

After leaving a sample for 24 hours at 23 ° C. and 50% RH, the hardness was measured using a Shore A durometer according to ASTM D 2240A.

Experimental Example  4: Peel strength

Samples cut to a width of 20 mm and a length of 150 mm are left for 24 hours at 23 ° C and 50% RH, and then peeled at a tensile rate of 500 mm / min using an Instron Universal Testing Machine. Intensity was measured. The result was the average of the measurements.

division Tensile Strength (kgf / ㎠) Elongation (%) Shore Hardness (A) Peel Strength (gf / cm) Example 70 290 62 450 Comparative example 50 600 23 <50

As described above, the shock absorbing and sealing sheet manufactured according to the present invention uses a soft polyurethane as a material, and has a physical property equal to or higher than that of a conventional silicone resin pad, is inexpensive, and has mechanical properties and adhesive strength. This excellent effect is effective in shock absorption and sealing (sealing) of electronic devices, etc., there is an advantage that can be easily applied to the automation process.

Claims (17)

A shock absorbing and sealing sheet in which an adhesive layer, a polyurethane layer, and a surface coating layer are sequentially stacked. The method of claim 1, The sheet is a shock absorbing and sealing sheet having a thickness of 106 to 2120 ㎛. The method of claim 1, The sheet has a tensile strength of 50 to 500 kgf / ㎠ a shock absorbing and sealing sheet. The method of claim 1, The sheet is 100% to 600% elongation of the shock absorbing and sealing sheet. The method of claim 1, The sheet is a shock absorbing and sealing sheet of Shore A hardness (Shore A hardness) of 25 to 80. The method of claim 1, The adhesive layer is a shock absorbing and sealing sheet is prepared from one or more selected from the group consisting of vinyl acetate, methyl methacrylate, ethyl acetoacrylate and sulfonated polystyrene. The method of claim 1, The adhesive layer is a sheet for impact absorption and sealing that the peel strength is at least 150 gr / cm. The method of claim 1, The adhesive layer is a sheet for impact absorption and sealing is 5 to 100 ㎛ thickness. The method of claim 1, The polyurethane layer is selected from the group consisting of methylene diphenyl isocyanate (MDI), toluene diisocyanate (TDI), methylene diphenyl isocyanate (MDI) oligomer, toluene diisocyanate (TDI) oligomer, and carbodiimide modified methylene diisocyanate At least one diisocyanate; And 1,4-butanediol, polypropylene glycol, polytetramethylene glycol, and polyethylene glycol, and a shock absorbing and sealing sheet prepared by reacting at least one polyol selected from the group consisting of. The method of claim 1, The polyurethane layer is a shock absorbing and sealing sheet is 0.1 to 2.0 mm in thickness. The method of claim 1, The surface coating layer is an acrylic polymer prepared from an acrylic monomer or oligomer comprising silicon acrylate, silicon methacrylate, acrylic acid, methacrylic acid, methyl methacrylate, and methyl methacrylate; Urethane-acrylate copolymers or blends; Or a sheet for shock absorbing and sealing is prepared from one or more selected from the group consisting of polyethylene, polypropylene, polyvinylidene fluoride, and a vinyl-based polymer including teflon. The method of claim 1, The surface coating layer is a shock absorbing and sealing sheet having a friction coefficient of 2 to 20 to the glass relative surface. The method of claim 1, The surface coating layer has a thickness of 0.5 to 10 ㎛ sheet for shock absorption and sealing. The method of claim 1, The shock absorbing and sealing sheet further comprises a pressure-sensitive adhesive layer laminated between the polyurethane layer and the adhesive layer. The method of claim 14, The adhesive auxiliary layer is a shock absorbing and sealing sheet is prepared from one or more selected from the group consisting of urethane acrylates, copolymers of urethane acrylates and acrylic monomers, and mixtures of urethanes and acrylics. The method of claim 14, Wherein the adhesive auxiliary layer has a peel strength of at least 300 gr / cm with respect to the polyurethane layer. The method of claim 14, The adhesive auxiliary layer has a thickness of 0.5 to 10 ㎛ sheet for shock absorption and sealing.

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