KR101486830B1 - Cushioning for heat press and method for preparing the same - Google Patents

Abstract

Disclosed are a cushioning material for a heat press, which can be used to improve the efficiency of work using a heat press, and a method for preparing the same. The cushioning material for a heat press comprises a nonwoven fabric layer having both sides coated with a rubber composition selected from the group consisting of a fluoro rubber composition and a silicone rubber composition; rubber sheets attached on each of the upper surface and the lower surface of the nonwoven fabric having both sides coated with the rubber composition, and made of a material selected from the group consisting of a fluoro rubber sheet and a silicone rubber sheet; and a fabric layer located on both outermost layers in the laminated direction, coated with a rubber composition selected from the group consisting of a fluoro rubber composition and a silicone rubber composition, and attached on the rubber sheets. The rubber composition and the rubber sheets are made of the same material.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning material for hot pressing,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cushioning pad for hot pressing and a method of manufacturing the same, and more particularly, to a cushioning pad for hot pressing capable of improving the efficiency of work using a hot press by using an improved cushioning pad, .

The heat press may be a printed board such as a copper clad laminate (CCL), a flexible printed circuit board (FPCB), or a multilayer laminate, a laminated structure such as an IC card, a liquid crystal display board and a ceramic laminate The object to be squeezed is positioned between the upper plate and the lower plate, which are the hot plates of the hot press, and then the upper and lower parts of the hot press, Press the plates against each other. At this time, defects are generated in the objects located therebetween by the impact caused by the pressure applied to the upper and lower plates, the uneven pressure and the heat. To prevent or alleviate the defects, the buffer plate A cushioning material is attached. In addition, the cushioning material should be excellent in thermal conduction to efficiently transfer the heat of the thermal press to the object to be squeezed.

However, in the conventional cushioning material, since the time required for returning to the original state after the cushioning material to be buffered is pressed is long, there is a problem in restoring force, thermal conduction is not efficient, there are various problems such that burrs are generated and are not easily removed or that they are not easily separated from the sus plate of the hot press after use. In addition, the fabrics and nonwoven fabrics mainly used as the internal components of the cushioning material have various problems due to the pressure of the hot press. In the case of the fabric, when the constant temperature and pressure are applied, And in the case of nonwoven fabric, peeling phenomenon occurs and it has a limitation that it can be used only for disposable use. Also, the foreign matter generated from the nonwoven fabric itself is also a disadvantage.

Korean Patent Laid-Open Publication No. 10-2000-0017067 discloses a rubber for a cushioning material of a hot press and a manufacturing method thereof. In order to improve bufferability, thermal conductivity and durability, a fluororubber added with a vulcanizing agent or the like is used. In addition to the components added to the fluororubber, the fabric and nonwoven fabric except rubber are used Which is different from the present invention. Korean Patent Laid-Open Publication No. 10-2005-0030889 discloses a cushioning material for hot press and a method for producing a laminated plate. Nonwoven fabrics and rubbers are similar to the present invention except that the nonwoven fabrics are made of mixed fibers for the purpose of improving cushioning and thermoelectric performance, which is different from the present invention in which the nonwoven fabric is rubber coated. Korean Patent Laid-Open Publication No. 10-2007-0018111 discloses a cushioning material for hot pressing. The composition of the layer made of only rubber is similar to that of the present invention, but the fibers existing in the upper and lower layers improving the elasticity include other components Is different from the present invention in which the fabric and the nonwoven fabric are coated with rubber to further improve the buffering property.

An object of the present invention is to provide a cushioning pad for hot press which can improve buffering, thermal conductivity, heat resistance, strength and durability by coating a rubber composition on a fabric and a nonwoven fabric and adding various additives to the rubber sheet, And a method for manufacturing the same.

Another object of the present invention is to provide a cushioning pad for hot press which can improve the adhesion between the rubber composition and the rubber sheet by coating the rubber composition on the fabric and the nonwoven fabric, and a method for producing the same.

It is another object of the present invention to provide a nonwoven fabric capable of suppressing burrs generated in fabrics and nonwoven fabrics by coating a rubber composition on fabrics and nonwoven fabrics, And a method of manufacturing the same.

In order to achieve the above object, the present invention provides a nonwoven fabric comprising a nonwoven fabric layer coated on both sides with a rubber composition selected from the group consisting of a fluororubber composition and a silicone rubber composition; A rubber sheet made of a material selected from the group consisting of a fluororubber sheet and a silicone rubber sheet adhered to an upper surface and a lower surface of a nonwoven fabric coated on both sides with the rubber composition; And a fabric layer which is disposed on both outermost layers in a stacking direction and is coated with a rubber composition selected from the group consisting of a fluorine rubber composition and a silicone rubber composition and which is bonded to the rubber sheet, The sheet provides the cushioning material for hot pressing made of the same material.

The present invention also provides a method of manufacturing a nonwoven fabric, comprising the steps of: coating a nonwoven fabric and a fabric, respectively, with a rubber coating solution selected from the group consisting of a fluororubber coating solution and a silicone rubber coating solution containing a solvent and a rubber composition; Preparing a rubber sheet that is positioned between the nonwoven fabric and the fabric coated with the rubber coating solution; And a nonwoven fabric layer coated on both sides with a rubber composition in which solvent is removed from the rubber coating solution by pressing and bonding the nonwoven fabric and the fabric coated with the rubber coating solution and the rubber sheet while simultaneously removing the solvent, And a step of producing a heat-press cushioning material comprising a rubber sheet adhered to the lower surface and a layer disposed on both outermost layers in a stacking direction and coated with the rubber composition and adhered to the rubber sheet, A method of manufacturing a cushioning pad for press is provided.

According to the cushioning pad for hot pressing and the method of producing the same according to the present invention, it is possible to improve the buffering property, thermal conductivity, heat resistance, strength and durability by coating a rubber composition on a fabric and a nonwoven fabric and adding various additives to the rubber sheet , The adhesion between the fabric and the rubber sheet and between the nonwoven fabric and the rubber sheet can be improved, and the burr generated in the fabric and the nonwoven fabric can be suppressed. Further, the cushioning pad for hot pressing according to the present invention can be easily separated from the hot plate of the hot press.

1 is a side view showing a structure of a cushioning pad for hot pressing according to an embodiment of the present invention;
2 is a side view showing the structure of a cushioning pad for hot pressing according to another embodiment of the present invention;

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a side view showing a structure of a cushioning pad for hot pressing according to an embodiment of the present invention. 1, the cushioning pad for hot pressing according to the present invention comprises a nonwoven fabric layer 10 coated on both sides with a rubber composition 50 selected from the group consisting of a fluororubber composition and a silicone rubber composition, a rubber composition 50 A rubber sheet 20 which is adhered to the upper and lower surfaces of the nonwoven fabric layer 10 coated on both sides with a rubber layer and is made of a material selected from the group consisting of a fluororubber sheet and a silicone rubber sheet, And a fabric layer 30 coated with a rubber composition 50 selected from the group consisting of a fluororubber composition and a silicone rubber composition and bonded to the rubber sheet 20 .

The nonwoven fabric layer 10 coated on both sides of the nonwoven fabric 10a with the rubber composition 50 selected from the group consisting of the fluororubber composition and the silicone rubber composition is located at the center of the cushioning pad for hot pressing according to the present invention Durability, strength and adhesiveness as compared with a general nonwoven fabric which is generally used, and it is preferable that the temperature of the hot press (generally not higher than 200 占 폚) , And when the temperature and pressure by the hot press are applied, it is possible to prevent delamination and yarn scattering occurring in ordinary nonwoven fabrics, and to improve durability and strength, And can be maintained firmly even under pressure. The nonwoven fabric layer 10 coated with the rubber composition 50 on the nonwoven fabric 10a can be easily removed from the surface of the heat-resistant cushioning material 10 in accordance with the present invention, The adhesion with other materials used in the cushioning material for press is excellent and the number of working steps of the hot press can be increased.

The nonwoven fabric 10a may be formed by arranging the fibers in parallel or in a negative direction and using conventional nonwoven fabrics bonded with a synthetic resin adhesive. For example, polyester fibers, glass fibers, polyimide fibers, meta-aramids a carbon fiber formed from a metal yarn made of a metal such as stainless steel (meta-aramide) fiber or stainless steel and an oxidized polyacrylonitrile (O-PAN) And a nonwoven fabric made of meta-aramid fibers can be used. The thickness of the nonwoven fabric layer 10 coated on both sides with the rubber composition 50 is 0.1 to 3 mm, preferably 0.2 to 1 mm, more preferably 0.3 to 0.8 mm, The length and the length of the hour can be flexible according to the standard of the hot press. The rubber composition 50 is used in an amount of 5 to 50 parts by weight, preferably 10 to 30 parts by weight, per 100 parts by weight of the nonwoven fabric 10a. ) Is less than 5 parts by weight, adhesion may be weakened. When the amount is more than 50 parts by weight, the adhesive strength may not be further improved, and further, the thickness becomes thick and it is troublesome to scrape with a tool such as a knife have.

As described above, the rubber composition 50 selected from the group consisting of the fluorine rubber composition and the silicone rubber composition can improve stability, thermal conductivity, heat resistance, strength and durability, To enable adhesion.

The content of the fluorine rubber is preferably from 1 to 15 parts by weight, more preferably from 2 to 10 parts by weight, based on 100 parts by weight of the fluorine rubber, and the content of magnesium oxide (MgO) The content of calcium hydroxide (Ca (OH) ₂ ) is 0.1 to 10 parts by weight, preferably 0.2 to 9 parts by weight based on 100 parts by weight of the fluororubber, and black carbon (MT (N-990), Lehmann & (Germany)) is 0.1 to 1.5 parts by weight, preferably 0.3 to 1 part by weight based on 100 parts by weight of the fluororubber, and silica (Min-U-Sil-5, US Silica Company, USA) Is 5 to 35 parts by weight, preferably 10 to 30 parts by weight based on 100 parts by weight of the fluororubber, and the content of barium sulfate (BaSO ₄ ) is 5 to 35 parts by weight a portion, preferably from 10 to 30 parts by weight of iron oxide (Fe ₂ O ₃₎ content is, the fluorine and 100 parts by weight of 1 to 15 parts by weight, preferably from 3 to 10 parts by weight. On the other hand, if necessary, it may further include a rubber processing aid and an antistatic agent. When the rubber processing aid is used, flowability and dispersion of the rubber composition 50 can be smoothly performed, And the use of the above antistatic agent can further improve the antistatic property.

The magnesium oxide affects the peeling of the cushioning material and the stainless steel plate. If the content of the magnesium oxide is less than 1 part by weight based on 100 parts by weight of the fluororubber, the activity (crosslinking) of the rubber composition 50 may be lowered And when it exceeds 15 parts by weight, the activity (crosslinking) may be excessively increased. If the amount of the calcium hydroxide is less than 0.1 part by weight based on 100 parts by weight of the fluororubber, the activity (crosslinking) may be lowered. If the amount is more than 10 parts by weight, ) May be excessively high. When the content of the black carbon is less than 0.1 parts by weight based on 100 parts by weight of the fluororubber, there is a fear that the antistatic effect is not obtained. When the content is more than 1.5 parts by weight, It may be absent. The silica serves to increase the strength and elasticity of the cushioning material. If the amount of the silica is less than 5 parts by weight based on 100 parts by weight of the fluororubber, the adhesion between the cushioning material and the stainless steel plate is improved, It may be difficult to peel off the stainless steel plate. When the amount exceeds 35 parts by weight, not only the restoration property and abrasion resistance of the cushioning material deteriorate but also the adhesion with the fabric may be deteriorated. The barium sulfate affects hardness and acid resistance. If the content is less than 5 parts by weight based on 100 parts by weight of the fluororubber, the acid resistance may be lowered. If the amount is more than 35 parts by weight, have. If the content of the iron oxide is less than 1 part by weight based on 100 parts by weight of the fluororubber, the thermal conductivity may be lowered. If the content is more than 15 parts by weight, the thermal conductivity may be improved. There is a possibility that the elasticity may drop sharply.

The content of the silicone rubber is 100 parts by weight and the content of the black carbon is 0.1 to 1.5 parts by weight, preferably 0.3 to 1 part by weight based on 100 parts by weight of the silicone rubber, (Fe ₂ O ₃ ) is 0.5 to 5 parts by weight, preferably 1 to 3 parts by weight, based on 100 parts by weight of the silicone rubber. On the other hand, if necessary, it may further contain a curing agent. When the curing agent is used, the curing (crosslinking) degree of the rubber composition 50 can be controlled.

When the content of the black carbon is less than 0.1 parts by weight based on 100 parts by weight of the silicone rubber, there is a fear that the antistatic effect is not obtained. When the content is more than 1.5 parts by weight, It may be absent. The iron oxide affects the thermal conductivity of the cushioning material. If the content of the iron oxide is less than 0.5 part by weight based on 100 parts by weight of the silicone rubber, the thermal conductivity may be deteriorated. If the amount is more than 5 parts by weight, There is a possibility that the elasticity may drop sharply.

Next, the rubber sheet 20 made of a material selected from the group consisting of a fluorine rubber sheet and a silicone rubber sheet is adhered to the upper and lower surfaces of the nonwoven fabric layer 10 coated on both sides with the rubber composition 50 And is capable of withstanding a high temperature of 400 ° C or higher, and is preferably a high-heat-resistant elastic composite material capable of withstanding temperatures of 0 to 400 ° C, more preferably 100 to 250 ° C. The thickness of the rubber sheet 20 is 0.05 to 0.8 mm, preferably 0.1 to 0.7 mm, and more preferably 0.15 to 0.5 mm.

The content of the fluorine rubber is 100 parts by weight and the content of magnesium oxide is 1 to 12 parts by weight, preferably 2 to 9 parts by weight, relative to 100 parts by weight of the fluorine rubber, and the content of calcium hydroxide Is 0.5 to 8 parts by weight, preferably 1 to 6 parts by weight, relative to 100 parts by weight of the fluororubber, and the content of black carbon is 0.1 to 3 parts by weight, preferably 0.3 And the content of silica is 5 to 35 parts by weight, preferably 10 to 30 parts by weight, relative to 100 parts by weight of the fluororubber, and the content of iron oxide (Fe ₂ O ₃ ) 0.5 to 5 parts by weight, preferably 1 to 3 parts by weight, based on the weight of the composition. On the other hand, if necessary, a rubber processing aid may be further included. When the rubber processing aid is used, the flowability and dispersibility of the fluorine rubber sheet are improved.

If the content of the magnesium oxide is less than 1 part by weight based on 100 parts by weight of the fluororubber, the activity (crosslinking) may be lowered. If the content is more than 12 parts by weight, the activity (crosslinking) may be excessively increased. If the content of the calcium hydroxide is less than 0.5 parts by weight based on 100 parts by weight of the fluororubber, the activity (crosslinking) may be lowered. If the content is more than 8 parts by weight, the activity (crosslinking) may excessively increase. If the content of the black carbon is less than 0.1 part by weight based on 100 parts by weight of the fluororubber, there is a fear that the antistatic effect will not be obtained. If the content is more than 3 parts by weight, the further improvement in the antistatic property may not be obtained. If the amount of the silica is less than 5 parts by weight based on 100 parts by weight of the fluororubber, the adhesion between the cushioning material and the stainless steel plate is improved, but the cushioning material and the stainless steel plate may be difficult to peel off. , There is a possibility that not only the restoration property and abrasion resistance of the cushioning material deteriorate but also the adhesiveness with the fabric is lowered. If the content of the iron oxide is less than 0.5 parts by weight based on 100 parts by weight of the fluororubber, the thermal conductivity may be lowered. If the content is more than 5 parts by weight, the thermal conductivity may be improved but the abrasion resistance and elasticity may be drastically lowered.

The content of the silicone rubber is 100 parts by weight and the content of the black carbon is 0.05 to 1 part by weight, preferably 0.1 to 0.5 part by weight based on 100 parts by weight of the silicone rubber, The content of titanium dioxide (TiO ₂ ) is 0.5 to 25 parts by weight, preferably 1 to 20 parts by weight, based on 100 parts by weight of the silicone rubber. On the other hand, if necessary, a releasing agent and a curing agent can be further included. When the releasing agent is used, the generation of static electricity can be suppressed on the basis of excellent releasability, and the use of the curing agent suppresses the generation of odor .

If the content of the black carbon is less than 0.05 part by weight based on 100 parts by weight of the silicone rubber, there is a fear that the antistatic effect is not obtained. If the content is more than 1 part by weight, the antistatic property may not be further improved. The titanium dioxide is a filler and affects the hardness and abrasion resistance. When the content is less than 0.5 part by weight based on 100 parts by weight of the silicone rubber, there is a fear that the degree of elasticity is excessive. When the amount is more than 25 parts by weight, Not only deteriorates but also the elasticity may be lowered.

Next, the fabric layers 30 coated with the rubber composition 50 selected from the group consisting of the fluorine rubber composition and the silicone rubber composition are each positioned one on each of the outermost layers in the stacking direction, 50 to the rubber sheet 20, respectively. The fabric layer 30 coated with the rubber composition 50 is able to withstand temperatures as high as 300 ° C. or higher above the temperature of the hot press (generally below 200 ° C.) (50), which is included in the hot-press cushioning material according to the present invention, unlike the case where the temperature and pressure of the cushioning material are changed and the shape of the fabric is deformed and burrs are formed, The fabric layer 30 is suitable for multifaceted use because the fabric shape is not deformed and no foreign matter is generated even when the temperature and pressure by the hot press are applied.

On the other hand, the fabric 30a can be used without limitation as long as it has properties capable of preventing static electricity from being charged on the surface of the hot-press cushioning material and improving the tensile strength and the like of the hot-press cushioning material. For example, It is possible to use a fabric obtained by singly or in combination of carbon fibers formed from metal fibers made of metal such as fiber, glass fiber, polyimide fiber, meta-aramid fiber, stainless steel and oxidized polyacrylonitrile (O-PAN) , Preferably a fabric made of glass fibers. When the glass fiber is coated with the rubber composition (50), not only the glass fiber powder adheres to the user's body, but also the glass fiber-specific stickiness is prevented, and the warmth is also improved. The materials of the nonwoven fabric 10a and the fabric 30a may be the same or different depending on the use conditions. Further, the thickness of the fabric layer 30 coated with the rubber composition 50 is 0.1 to 3 mm, preferably 0.2 to 1 mm, and more preferably 0.3 to 0.8 mm. The amount of the rubber composition 50 to 100 parts by weight of the fabric 30a is 5 to 50 parts by weight and preferably 10 to 30 parts by weight and the amount of the rubber composition 50 Is less than 5 parts by weight, the adhesion may be weakened. When the amount is more than 50 parts by weight, the adhesive strength may not be further improved, and further, the thickness becomes thick and it is troublesome to scrape with a tool such as a knife .

The rubber composition 50 selected from the group consisting of a fluororubber composition and a silicone rubber composition coated on the fabric 30a may be used to improve the properties and effects of the rubber composition 50 coated on the nonwoven fabric 10a, The composition and the composition of the silicone rubber composition are all the same and the thickness when coated on the nonwoven fabric 10a and the fabric 30a is 0.02 to 0.5 mm, preferably 0.05 to 0.2 mm, more preferably 0.1 to 0.15 mm mm.

In order to further improve the strength and durability of the heat-press cushioning material according to the present invention, the rubber composition 50 coated on the fabric 30a may be provided on a surface which does not adhere to the rubber sheet 20, In other words, in a hot press cushioning material, it can also be coated on the lowermost surface in the direction to be laminated and / or in the laminated direction.

Meanwhile, the rubber composition 50 coated on the nonwoven fabric 10a and the fabric 30a and the rubber sheet 20 bonded to the rubber composition 50 are made of the same material. For example, the rubber sheet 50 20 is a fluororubber sheet, the rubber composition 50 is also a fluororubber composition, and if the rubber sheet 20 is a silicone rubber sheet, the rubber composition 50 is also a silicone rubber composition. The rubber sheet (20) and the rubber composition (50) are the same, meaning that the main components thereof are the same as the fluororubber or silicone rubber, and the kinds and contents of the various other additives may be different from each other.

The thermal press cushioning material according to one embodiment of the present invention described above (shown in FIG. 1) comprises one layer of a nonwoven fabric layer 10 coated with a rubber composition 50 and two layers of a fabric layer 30, And the rubber sheet 20 is composed of two layers and has a thickness of 1 to 4.5 mm, preferably 2 to 4 mm, more preferably 2.5 to 3 mm, a density of 0.8 to 2 g / cm ³ , Is in the range of 1 to 1.5 g / cm ³ and the restoring force is 60 to 90%, preferably 65 to 80%, the heat-resistant temperature is 300 ° C or lower, preferably 250 ° C or lower and the surface resistance is 10 ³ to 10 ²⁰ Ω / sq, preferably 10 < ⁵ > to 10 < ¹¹ >

2 is a side view showing the structure of a cushioning pad for hot pressing according to another embodiment of the present invention. A cushioning pad for hot pressing according to the present invention comprises a total of five layers of cushioning pad for thermal press comprising a nonwoven fabric layer (10) and a fabric layer (30) coated with the rubber composition (50) In addition, as shown in FIG. 2, the nonwoven fabric layer 10 is composed of two layers of the nonwoven fabric layer 10 coated with the rubber composition 50, two layers of the fabric layer 30, and three layers of the rubber sheet 20, Layer. The nonwoven fabric layer 10 and the fabric layer 30 coated with the rubber composition 50 are positioned on both outermost layers in the direction in which two layers of the fabric layer 30 coated with the rubber composition 50 are laminated, The nonwoven fabric layer 10 and the rubber sheet 20 coated with the rubber composition 50 placed between two layers of the fabric layer 30 coated with the rubber composition 50 Alternatively stacked structures may be included without limitation.

The cushioning pad for hot pressing according to another embodiment of the present invention as shown in FIG. 2 is more rigid than the hot press cushioning pad (five-layer structure) according to an embodiment of the present invention, and has a thickness of 3 to 8 mm , Preferably from 4 to 7 mm, more preferably from 4.5 to 6.5 mm, the density is from 1 to 2.5 g / cm ³ , preferably from 1.5 to 2 g / cm ³ , the restoring force is from 70 to 90% Is 75 to 80%, the heat resistance temperature is 300 占 폚 or lower, preferably 250 占 폚 or lower, and the surface resistance is 10 ³ to 10 ²⁰ ? / Sq, preferably 10 ⁵ to 10 ¹¹ ? / Sq.

On the other hand, as described above, when the physical properties of the hot press cushioning material (five-layer structure) according to one embodiment of the present invention and the cushioning material for hot press (seven-layer structure) according to another embodiment of the present invention are compared, It can be seen that the more the nonwoven fabric layer 10 and the rubber sheet 20 coated with the nonwoven fabric layer 50 are added, the better the resilience of the hot-press cushioning material is.

Next, a method of manufacturing the cushioning pad for hot pressing according to the present invention will be described with reference to Fig. The manufacturing method to be described below is only one of the methods for manufacturing the cushioning pad for hot pressing, and does not include all of the present invention.

In order to produce the cushioning pad for hot pressing according to the present invention, first, a rubber coating solution (not shown) is selected from the group consisting of a fluororubber coating solution and a silicone rubber coating solution containing a solvent and a rubber composition 50 , A non-woven fabric 10a which is not coated is coated to prepare a nonwoven fabric coated with a rubber coating liquid. Next, in the same manner as the above process, a non-coated fabric 30a (not shown) is coated with a rubber coating solution (not shown) selected from the group consisting of fluorine rubber coating solution and silicone rubber coating solution containing solvent and rubber composition 50 ) To prepare a fabric coated with a rubber coating solution. Next, a rubber sheet 20 to be positioned between the nonwoven fabric and the fabric coated with the rubber coating solution is prepared.

The nonwoven fabric and the fabric coated with the rubber coating solution should be stored in a place free from wind and sunlight such as sunlight so that the solvent contained in the coating solution does not evaporate until the bonding process is performed, When a mixed rubber coating liquid is used, it can be easily cured, so that a rapid bonding process must be performed.

On the other hand, the solvent contained in the fluororubber coating liquid and the silicone rubber coating liquid is selected from ketones such as methyl ethyl ketone, methyl isobutyl ketone, acetone and dimethyl ketone, ethers such as ethyl acetate ether and alcohols such as methyl alcohol and isopropyl alcohol (Rubber composition (50)), such as alcohols such as toluene, and the like, may be used singly or in admixture, preferably a mixture of methyl ethyl ketone and methyl isobutyl ketone, a mixture of methyl A mixture of ethyl ketone and acetone and toluene may be used. When the nonwoven fabric 10a and the fabric 30a are coated with the solvent, the solvent content may be 100 parts by weight of the fluororubber contained in the fluororubber coating solution, Is preferably 100 to 500 parts by weight based on 100 parts by weight of the silicone rubber contained in the silicone rubber coating liquid, 200 to the 400 parts by weight.

Next, each of the nonwoven fabric and the fabric coated with the rubber coating solution, and the manufacture of the rubber sheet 20 are completed, the nonwoven fabric and the fabric coated with the rubber coating solution, and the rubber sheet 20 are introduced into the compression device , A fabric coated with the rubber coating liquid is disposed on both outermost layers in the stacking direction, the rubber sheet (20) is disposed next to two woven fabrics coated with the rubber coating solution, and the center portion is coated with the rubber coating solution The nonwoven fabric is placed. Then, the nonwoven fabric and the fabric coated with the disposed rubber coating liquid, and the rubber sheet 20 are similarly advanced and passed through a compression device to be pressed and adhered, and at the same time, heated and contained in the rubber coating liquid The nonwoven fabric and the fabric coated with the rubber coating solution and the rubber sheet 20 are cut in the same line so as to meet the hot plate specification of the hot press. By performing all the above steps, the nonwoven fabric layer 10 coated on both sides with the rubber composition 50 from which the solvent is removed from the rubber coating solution, the upper surface and the lower surface of the nonwoven fabric layer 10 coated on both sides with the rubber composition 50 And a fabric layer (30) which is located on both outermost layers in a laminated direction and which is coated with the rubber composition (50) and adhered to the rubber sheet (20) The hot-press cushioning material according to the invention is produced.

Hereinafter, the present invention will be described in more detail with reference to specific examples. The following examples illustrate the present invention and are not intended to limit the scope of the present invention.

[Production Examples 1 to 5] Preparation of fluororubber composition

To evaluate the fluorine rubber composition, a fluorine rubber composition containing the components shown in the following Table 1 was prepared. On the other hand, the content of the other components except for the fluorine rubber means the parts by weight shown with respect to 100 parts by weight of the fluorine rubber.

Fluorine rubber
(Parts by weight) MgO Ca (OH) ₂ Black Carbon Silica Barium sulfate Iron oxide Production Example 1 100 5 One 0.7 20 10 5 Production Example 2 100 5 5 0.1 10 20 10 Production Example 3 100 10 One 0.1 10 20 5 Production Example 4 100 10 5 0.7 20 10 10 Production Example 5 100 15 5 One 30 30 10

[Production Examples 6 to 10] Preparation of silicone rubber composition

In order to evaluate the silicone rubber composition, a silicone rubber composition comprising the components shown in Table 2 below was prepared. On the other hand, the content of the other components except for the silicone rubber means the parts by weight expressed with respect to 100 parts by weight of the silicone rubber.

Silicone rubber
(Parts by weight) Black Carbon Iron oxide Production Example 6 100 One 3 Production Example 7 100 0.5 3 Production Example 8 100 0.5 One Production Example 9 100 One One Production Example 10 100 0.3 0.5

[Production Examples 11 to 15] Preparation of fluorine rubber sheet

To evaluate the fluorine rubber sheet, a fluorine rubber sheet containing the components shown in the following Table 3 was prepared. On the other hand, the content of the other components except for the fluorine rubber means the parts by weight shown with respect to 100 parts by weight of the fluorine rubber.

Fluorine rubber
(Parts by weight) MgO Ca (OH) ₂ Black Carbon Silica Iron oxide Production Example 11 100 7 5 2 20 One Production Example 12 100 9 One One 10 3 Production Example 13 100 7 One 2 10 One Production Example 14 100 9 5 One 20 3 Production Example 15 100 2 8 0.5 30 0.5

[Production Examples 16 to 20] Preparation of silicone rubber sheet

In order to evaluate the silicone rubber sheet, a silicone rubber sheet containing the components shown in Table 4 was prepared. On the other hand, the content of the other components except for the silicone rubber means the parts by weight expressed with respect to 100 parts by weight of the silicone rubber.

Silicone rubber
(Parts by weight) Black Carbon Titanium dioxide Production Example 16 100 One 10 Production Example 17 100 0.1 10 Production Example 18 100 0.1 20 Production Example 19 100 One 20 Production example 20 100 0.3 5

As described above, the fluorine rubber compositions according to Production Examples 1 to 5, the silicone rubber compositions according to Production Examples 6 to 10, the fluorine rubber sheets according to Production Examples 11 to 15, and the silicone rubber sheets according to Production Examples 16 to 20, As a result of the addition and adherence to the cushioning material (the fluorine rubber composition is used in combination with the fluorine rubber sheet, and the silicone rubber composition is used in combination with the silicone rubber sheet), the effect is consistent with the object of the present invention.

The use of the heat-press cushioning material according to the present invention improves the buffering property, the thermal conductivity, the heat resistance, the strength and the durability, and a more efficient hot pressing process can be achieved. Further, by coating the rubber liquid on the fabric and the nonwoven fabric included in the hot-press cushioning material according to the present invention, the adhesion between the rubber sheet and the rubber sheet is improved, and the generation of foreign matters generated in the fabric and the nonwoven fabric is blocked, The degree of recycling of the hot-press cushioning material according to the present invention increases.

Claims (6)

A nonwoven fabric layer coated on both sides with a rubber composition selected from the group consisting of a fluororubber composition and a silicone rubber composition;
A rubber sheet made of a material selected from the group consisting of a fluororubber sheet and a silicone rubber sheet adhered to an upper surface and a lower surface of a nonwoven fabric coated on both sides with the rubber composition; And
And a fabric layer coated with a rubber composition selected from the group consisting of a fluorine rubber composition and a silicone rubber composition and disposed on both outermost layers in a stacking direction,
Wherein the silicone rubber sheet comprises 100 parts by weight of silicone rubber, 0.05 to 1 part by weight of black carbon based on 100 parts by weight of the silicone rubber, and 0.5 to 25 parts by weight of titanium dioxide (TiO ₂ ) based on 100 parts by weight of the silicone rubber,
Wherein the rubber composition and the rubber sheet are made of the same material. The fluorine rubber composition according to claim 1, wherein the fluorine rubber composition comprises 100 parts by weight of a fluorine rubber, 1 to 15 parts by weight of magnesium oxide (MgO) with respect to 100 parts by weight of the fluorine rubber, 0.1 to 10 parts by weight of calcium hydroxide Ca (OH) ₂ ), 0.1 to 1.5 parts by weight of black carbon relative to 100 parts by weight of the fluororubber, 5 to 35 parts by weight of silica relative to 100 parts by weight of the fluororubber, 5 to 35 parts by weight Barium sulphate (BaSO ₄ ) and iron oxide (Fe ₂ O ₃ ) in an amount of 1 to 15 parts by weight based on 100 parts by weight of the fluororubber. The silicone rubber composition according to claim 1, wherein the silicone rubber composition comprises 100 parts by weight of silicone rubber, 0.1 to 1.5 parts by weight of black carbon based on 100 parts by weight of the silicone rubber, and 0.5 to 5 parts by weight of iron oxide based on 100 parts by weight of the silicone rubber Cushioning material for thermal press. The fluorine rubber sheet according to claim 1, wherein the fluorine rubber sheet comprises 100 parts by weight of fluorine rubber, 1 to 12 parts by weight of magnesium oxide per 100 parts by weight of the fluorine rubber, 0.5 to 8 parts by weight of calcium hydroxide per 100 parts by weight of the fluorine rubber, 0.1 to 3 parts by weight of black carbon based on 100 parts by weight of the fluororubber, 5 to 35 parts by weight of silica relative to 100 parts by weight of the fluororubber, and 0.5 to 5 parts by weight of iron oxide based on 100 parts by weight of the fluororubber. Cushioning material. delete Coating a nonwoven fabric and a fabric, respectively, with a rubber coating liquid selected from the group consisting of a fluororubber coating liquid and a silicone rubber coating liquid containing a solvent and a rubber composition;
Preparing a rubber sheet that is positioned between the nonwoven fabric and the fabric coated with the rubber coating solution; And
The nonwoven fabric coated with the rubber coating solution, the nonwoven fabric layer coated on both sides with the solvent-removed rubber composition in the rubber coating solution, the upper surface of the nonwoven fabric layer and the non- And a fabric layer disposed on both outermost layers in a laminated direction and being coated with the rubber composition and adhered to the rubber sheet, the method comprising the steps of:
Wherein the silicone rubber sheet comprises 100 parts by weight of silicone rubber, 0.05 to 1 part by weight of black carbon based on 100 parts by weight of the silicone rubber, and 0.5 to 25 parts by weight of titanium dioxide (TiO ₂ ) based on 100 parts by weight of the silicone rubber A method of manufacturing a cushioning material for press.

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