KR101582475B1 - Cover material of leather using hyper-soft polyurethane foam and preparation method of the same - Google Patents
Cover material of leather using hyper-soft polyurethane foam and preparation method of the same Download PDFInfo
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- KR101582475B1 KR101582475B1 KR1020150121456A KR20150121456A KR101582475B1 KR 101582475 B1 KR101582475 B1 KR 101582475B1 KR 1020150121456 A KR1020150121456 A KR 1020150121456A KR 20150121456 A KR20150121456 A KR 20150121456A KR 101582475 B1 KR101582475 B1 KR 101582475B1
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- South Korea
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- leather
- polyurethane foam
- soft polyurethane
- foam
- cover material
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R13/00—Elements for body-finishing, identifying, or decorating; Arrangements or adaptations for advertising purposes
- B60R13/02—Internal Trim mouldings ; Internal Ledges; Wall liners for passenger compartments; Roof liners
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polyurethanes Or Polyureas (AREA)
- Laminated Bodies (AREA)
Abstract
Description
The present invention relates to a leather cover material using an ultra-soft polyurethane foam and a manufacturing method thereof. More particularly, the present invention relates to a leather cover material which is excellent in restoring force and elastic restoring force, And is excellent in durability and has superior air permeability without additional filter foam processing and can be provided with excellent softness and comfort compared with leather cover materials using conventional filter foams by using ultra soft polyurethane foam Leather cover material and a manufacturing method thereof.
Generally, leather products such as natural leather or artificial leather are used as raw materials when manufacturing leather products such as car seat, bed mattress and sofa, and there is elasticity and cushion by joining them using sponge or fiber paper as the sub materials. We manufacture this good leather cover product.
As a method for manufacturing a leather cover product, a hot melt adhesive is applied to a sponge, dried, and then heated with a leather, as disclosed in Korean Patent Laid-Open Publication No. 10-1996-0017143 by a hot melt method A method in which a web is laminated on a sponge, a leather is laid on the sponge, and the web is passed through a heating furnace to melt the web film to bond the leather to the sponge; And a spark laminating method in which a sponge is bonded to a leather by pressing it by passing through a pair of rollers in a state in which a liquid pressure-sensitive adhesive produced by heating is attached to the back of the leather, and the like are used. 20-0346633, Korean Patent No. 10-1276931, Korean Patent No. 10-1270720, etc.)
On the other hand, in the conventional methods, when the sponge having relatively high hardness is bonded to the leather, the orange peel phenomenon, which is not flat and wrinkled, is generated in the portion where the inwardly bent (R) A problem arises. Therefore, a method of joining leather by using a soft, highly elastic fiber such as a hocho-tex fiber is used for a part such as a headrest without using a sponge.
The reason for not using the existing sponge in the region where the inward bending (R) is applied is that the conventional sponge has a relatively high hardness (hardness of about 6 kgf / 314 cm 2 or more) and is not good in elasticity and resilience. This is because the orange peel phenomenon occurs because the wrinkles do not spread and the recovery does not work well.
As a related art, Korean Patent No. 10-1510023 discloses a method of manufacturing a leather cover material by bonding leather and a sponge so as to be suitable for use in automobile ventilation sheets, (A process of manufacturing a filter foam), and using a porous open-cell pore structure, the cold wind effect can be effectively exhibited in summer, and the interfacial adhesion strength between the leather and the sponge is improved.
However, since the sponge needs to be subjected to a membrane treatment process (filter foam production process) in this technology, there is a problem that a process is added. Even in the case of the sponge subjected to the membrane treatment, the air permeability is good, It is not possible to prevent the wrinkles (orange peel) from occurring in the chin portion, and the sponge subjected to the film treatment process has a problem that the hardness is so large that the comfort is low.
The present invention has been developed in consideration of the circumstances of the prior art as described above. It is an object of the present invention to provide a leather cover product by bonding a leather and a sponge, It is possible to prevent the occurrence of wrinkles (orange peel) due to the excellent elastic restoring force even when the polyurethane sponge foam is manufactured and used in a portion where the inside is bent (R) It is an object of the present invention to provide a leather cover material which is very comfortable due to the advantages of ultra-low hardness peculiar to a super soft polyurethane sponge foam.
In order to achieve the above object,
A leather covering material comprising a leather and a polyurethane foam bonded to the unused surface of the leather,
Wherein the polyurethane foam comprises 100 parts by weight of a polyol comprising a mixture of 30 to 55% by weight of a polyether polyol having a number average molecular weight of 2,000 to 5,000 and 45 to 70% by weight of a polyester polyol having a number average molecular weight of 1,000 to 3,000, A super soft polyurethane obtained by mixing 20 to 50 parts by weight of an isocyanate compound, 1 to 7 parts by weight of a crosslinking agent, 0.05 to 5 parts by weight of a reaction catalyst and 2 to 20 parts by weight of a foaming agent, The polyurethane has a porous open-cell structure and has a density of 15 to 30 kg / m 3 , a hardness (ILD 25%) of 1.0 to 4.5 kgf / 314 cm 2 , a thickness of 1.0 to 10.0 mm Wherein the leather cover material is made of a leather and an ultra-soft polyurethane foam.
In a preferred embodiment of the present invention, the ultra-soft polyurethane has an open-cell structure with a pore size of 70 to 100 ppi without filter foam processing.
Further, in a preferred embodiment according to the present invention, the leather may be natural leather, artificial leather or perforated leather.
Further, in a preferred embodiment according to the present invention, the leather and super soft polyurethane foam are attached to a flame lamination method, a hot-melt lining method, a web film bonding lamination method or an infrared (IR) heater indirect thermal lining method .
Further, in a preferred embodiment according to the present invention, the adhesion strength (separation strength) of the leather and the ultra-soft polyurethane foam can be maintained in the range of 1.0 to 1.5 kgf / cm.
Also, in a preferred embodiment according to the present invention, the leather cover material may be a car seat, a headrest, a bed mattress, a sofa, a bed quilting pad, a cushion, a medical instrument pad, a helmet pad, a goggle pad, A pillow or an elastic cushion.
The leather cover material made of the leather and the ultra-soft polyurethane foam according to the present invention is manufactured by bonding a leather and a sponge. The sponge used in this case has a very low hardness due to the composition of the polyol and the diisocyanate, Because it is used by being bonded directly to leather without separate film treatment process (filter foam processing process), it is very elastic recovery force even if it is used in the portion where the bending (R) is inward. (Orange peel) can be prevented from occurring when the human body is seated on the human body due to its excellent air permeability, excellent adhesion with leather and durability, and extremely low hardness peculiar to ultra soft polyurethane sponge foam It has a very good comfort.
The present invention will be described in more detail as follows.
The leather cover material according to the present invention comprises a leather and an ultra-soft polyurethane foam adhered to the unused surface of the leather.
The super soft polyurethane foam is prepared by condensation reaction using a polyol, a diisocyanate and an additive.
Specifically, a crosslinking agent, a reaction catalyst and a foaming agent are added as additives to polyols and diisocyanates as main raw materials, followed by condensation polymerization reaction and crosslinking reaction, followed by foaming and curing for a certain period of time.
In the present invention, the polyurethane foam is formed by a condensation polymerization reaction of a polyol and a diisocyanate. In the present invention, a mixture of a polyether polyol and a polyester polyol is used as the polyol. When the mixed polyol is used as described above, the bonding strength with the leather can be enhanced, and soft soft polyurethane can be formed.
More specifically, in the present invention, the polyurethane foam is a mixture of 30 to 55% by weight of a polyether polyol having a number average molecular weight of 2,000 to 5,000 and 45 to 70% by weight of a polyester polyol having a number average molecular weight of 1,000 to 3,000 Is used.
100 parts by weight of the mixed polyol and 20 to 50 parts by weight of diisocyanate are mixed with additives such as a crosslinking agent, a reaction catalyst and a foaming agent. The diisocyanate compound may be an aliphatic or aromatic diisocyanate compound generally used for forming a urethane structure.
In the present invention, in the case of the polyol, a polyol comprising a mixture of 30 to 55% by weight of a polyether polyol having a number average molecular weight of 2,000 to 5,000 and 45 to 70% by weight of a polyester polyol having a number average molecular weight of 1,000 to 3,000 is used Preferably, the polyester polyol having a number average molecular weight of 1,000 to 3,000 is contained in an amount of 45 to 70% by weight, the polyurethane foam having desired ultralow-hardness, that is, an ILD 25% hardness of 1.0 to 4.5 kgf / 314 cm 2 Can be obtained.
Here, 25% of the ILD (Load Defection 25%), which means the above hardness, means the weight required to contain 25% of the polyurethane foam. It means that 25% of the polyurethane foam having an area of 314 cm 2 is the minimum It means weight. A larger ILD 25% value means that the polyurethane foam is rigid, and the smaller the ILD 25% value, the more flexible it is.
In the present invention, the crosslinking agent to be added in the condensation reaction is a component which acts to strengthen the bonding by cross-linking the polyurethane chains. Examples of the crosslinking agent include diethanolamine, monoethylene glycol, diethylene glycol, 1,6- Silicate, trimethylolpropane triacrylate, and the like can be used. In the present invention, the content of the crosslinking agent is preferably in the range of 1 to 7 parts by weight based on 100 parts by weight of the polyol compound.
In the present invention, the reaction catalyst added during the condensation reaction is a component that activates the condensation reaction and the crosslinking reaction. Examples of the reaction catalyst include bis (dimethylaminoethyl) ether, triethylenediamine, N, N'-dimethylethanolamine , Stannous octate, dibutyltin dilaurate, dioctyltin dilaurate and the like can be used. In the present invention, the content of the reaction catalyst is preferably 0.05 to 5.0 parts by weight based on 100 parts by weight of the polyol compound.
As the foaming agent in the present invention, water may be used alone as a foaming agent, but methylene chloride, pentane, dichlorofluoromethane, trichlorofluoromethane, etc. may be used alone or in combination as an auxiliary foaming agent in order to enhance the foaming effect.
Further, in the production of the polyurethane foam of the present invention, additives such as a defoaming agent and a flame retardant may be further used.
As the antifoaming agent, a compound having a polyether side chain bonded to the polysiloxane main chain may be used. Specific examples thereof include B-8301, B-8228, BF-2470 from Evonik, Germany or L-580K from Momentive, USA.
As the flame retardant, compounds such as phosphate, phosphonate, phosphite, phosphinate, and phosphine oxide containing halogen and phosphorus can be used.
In the present invention, the polyurethane foam obtained by the condensation reaction and the incorporation of the foaming agent as described above has a porous open-cell structure. As described above, the porous open-cell polyurethane foam of the present invention is achieved by setting the reactant composition and the reaction conditions as described above, and air permeability is ensured without a separate membrane treatment process, that is, a filter foam processing process. That is, the polyurethane foam obtained as described above in the present invention is characterized in that it has an open-cell structure with a pore size of 70 to 100 ppi without filter foam processing.
When the pore size is as described above, the ventilation performance is excellent, so that the cooling function can be given to the cover material during the summer.
In the present invention, the polyurethane foam obtained by the above process is a super soft foam having a density of 15 to 30 kg / m 3 and a hardness (ILD 25%) of 1.0 to 4.5 kgf / 314 cm 2 . Such an ultra soft foam is excellent in elastic restoring force and durability, so that it has an effect of not generating orange peel when the leather cover material is used in a portion (R) of the headrest.
In the present invention, the thickness of the ultra-soft polyurethane bonded (bonded) to the unused surface of the leather is preferably within a certain range in order to impart an elastic restoring force. The thickness of the ultra- 10.0 mm is preferable.
Natural leather, artificial leather, etc. may be used as the leather used in the present invention, and fabrics (fabrics) such as various felts, straight wool, polyester fabrics and nonwoven fabrics, polyester resin backing cloths a backing clothe, an olefin resin sheet or a film may also be used. Also, holes of appropriate size may be perforated to provide air permeability, wherein the apertures are preferably about 0.4 to 0.6 mm in diameter and preferably 6 to 10 per cm 2 .
In the present invention, the leather and the ultra-soft polyurethane foam can be bonded to each other by various bonding methods. Examples of the bonding method include a flame laminating method, a hot-melt lining method, a web film bonding lamination method or an infrared A thermal lining method or the like can be used.
In the flame lamination method, one surface of a polyurethane foam is melted by heating using a direct heating means such as a flame, and the back surface (unused surface) of the leather is attached to the liquid adhesive liquid produced by the heating, So that the polyurethane foam is bonded to the leather.
In the hot-melt lamination method, a hot-melt adhesive is applied to a polyurethane foam, dried, and then pressed in a heating furnace while the leather is covered.
In addition, the web film bonding lining method is a method of laminating a leather and a polyurethane foam by laminating a web film on a polyurethane foam, covering the leather, and passing the web through a heating furnace to melt the web film.
In addition, the infrared (IR) heater indirect thermal lamination method is a method in which one surface of a polyurethane foam is heated and melted by indirect heating means such as an infrared (IR) heater, (Unused surface) of the polyurethane foam is adhered to the polyurethane foam by passing through a roller.
The leather cover material obtained by such a joining method preferably has an adhesive strength in the range of 1.0 to 1.5 kgf / cm. When it is included in the above adhesive strength range, the leather and the polyurethane foam may be integrated, so that they are not peeled off even in long-term use.
In addition, in the present invention, the leather used for the leather cover material may have an air permeability (air permeability) of 200 to 2,000 cm 3 / sec when it is used as leather formed with perforations, Process) is not necessary, so that the process can be simplified and the cost can be reduced.
In the present invention, the leather cover material made of the leather and the ultra-soft polyurethane foam can be widely applied to a leather product requiring elastic restoration. The leather cover material is mainly used for automobile seat, head rest, bed mattress, sofa, pad for bed quilting, A medical pad, a helmet pad, a goggle pad, an electric mat, a pillow, a hot water mat or an elastic cushion, or may be used for leather for bags, handbags, shoes, clothes and the like.
The present invention will be described in more detail with reference to the following examples, but it should be construed that the scope of the present invention should not be construed as being limited to the following examples, and variations are possible without departing from the scope of the present invention.
[Example]
Production Examples 1 to 3 and Comparative Production Examples 1 to 3 - Production of polyurethane foam
A polyurethane foam was prepared using the composition components shown in Table 1 below. That is, polyol, isocyanate and additives were mixed and stirred, and foam polymerization was carried out at a chamber pressure of 0.00125 kg / cm2 to prepare a polyurethane foam.
The polyurethane foam prepared in Comparative Examples 1 to 3 was used in the same manner as in Production Examples 1 to 3. The polyurethane foam prepared in Comparative Preparation Examples 1 to 3 was placed in a sealed chamber, After maintaining the pressure for about 8 minutes under a vacuum pressure, a mixed gas of hydrogen and nitrogen (mixing ratio of 3: 1) was introduced and maintained for about 50 minutes so that sufficient gas was introduced into the polyurethane foam. And the chamber was cooled immediately after the flame explosion was caused in the combustion and the discharge, and a membrane treatment process (filter foam processing process) was performed.
The raw materials used for preparing polyurethane foams in Production Examples 1 to 3 and Comparative Production Examples 1 to 3 are as follows.
1) Polyether polyol-1: NPP, number average molecular weight 3,000 OH value 50 to 60 mg KOH / g
2) Polyether polyol-1: POP, number average molecular weight 4,610 OH value 26-30 mgKOH / g
3) Polyester polyol-1: PEP-1, number average molecular weight 1,200 OH value 80 to 100 mg KOH / g
4) Polyester polyol-1: PEP-2, number average molecular weight 2,200 OH value 50 to 56 mg KOH / g
5) T-80: diisocyanate in which 2,4-TDI (toluene diisocyanate) and 2,6-TDI are present in an 80:20 molar ratio, equivalent weight 87.5
6) Polysiloxane: Polyalkyleneoxydimethylsiloxane copolymer
7) Sn.oct: Stannus octoate (organotin)
8) TEDA-33LV: Tetraelene diamine catalyst
9) Phosphate: Chlorine-containing aliphatic phosphate
[Property evaluation]
(SEM analysis), rebound resilience (JIS K6401), air permeability (JIS L 1096-A), apparent density (JIS K 7222), hardness (ILD 25%, JIS K 64002 ), Tensile strength (JIS K 6400-5) and bonding strength (tear strength, JIS K 6400-5) were measured and are summarized in the following Table 1.
ingredient
(Parts by weight)
As shown in Table 1, it can be seen that the polyurethane foam produced by the method according to the present invention forms a porous open-cell structure even without a separate membrane treatment process, and has a low density, a pore size, (ILD 25%) is very small, so it has excellent resilience and high durability.
[Appearance evaluation of leather cover material]
The polyurethane foam prepared in Preparation Examples 1 to 3 and Comparative Preparation Examples 1 to 3 was bonded to the unused surface of natural leather using a flame lamination method to a thickness of about 5 mm.
The surface condition of the leather cover material thus manufactured was visually observed 30 days after covering the headrest with the curved (R) head. As a result of observation, it was found that wrinkles (orange peel) occurred on the surface in Comparative Production Examples 1 to 3, but it was confirmed that no wrinkles (orange peel) occurred on the surface in Production Examples 1 to 3.
As described above, the leather cover material made of the leather and the ultra-soft polyurethane foam according to the present invention is excellent in the elastic restoring force by bonding to the rear surface of the leather using the very high hardness polyurethane foam of the very high hardness, If you can solve the existing orange peel problem.
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 embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. will be.
Claims (6)
Wherein the polyurethane foam comprises 100 parts by weight of a polyol comprising a mixture of 30 to 55% by weight of a polyether polyol having a number average molecular weight of 2,000 to 5,000 and 45 to 70% by weight of a polyester polyol having a number average molecular weight of 1,000 to 3,000, A super soft polyurethane obtained by mixing 20 to 50 parts by weight of an isocyanate compound, 1 to 7 parts by weight of a crosslinking agent, 0.05 to 5 parts by weight of a reaction catalyst and 2 to 20 parts by weight of a foaming agent, The polyurethane has a porous open-cell structure and has a density of 15 to 30 kg / m 3 , a hardness (ILD 25%) of 1.0 to 4.5 kgf / 314 cm 2 , a thickness of 1.0 to 10.0 mm Characterized in that it is comprised of a leather and an ultra-soft polyurethane foam.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150121456A KR101582475B1 (en) | 2015-08-28 | 2015-08-28 | Cover material of leather using hyper-soft polyurethane foam and preparation method of the same |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020150121456A KR101582475B1 (en) | 2015-08-28 | 2015-08-28 | Cover material of leather using hyper-soft polyurethane foam and preparation method of the same |
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| KR101582475B1 true KR101582475B1 (en) | 2016-01-19 |
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| KR1020150121456A KR101582475B1 (en) | 2015-08-28 | 2015-08-28 | Cover material of leather using hyper-soft polyurethane foam and preparation method of the same |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101733929B1 (en) * | 2016-08-22 | 2017-05-08 | 주식회사 유엠에스 | Slip-typed Polyurethane Foam and Seat-Cover using the same |
| KR20230023309A (en) * | 2021-08-10 | 2023-02-17 | 대원산업 주식회사 | Integral foaming cover material and manufacturing method thereof |
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| KR20010100234A (en) * | 2000-03-21 | 2001-11-14 | 염규봉 | Flameretardant Polyurethane Foam and Polyol Composition for Preparing the Foam |
| KR20120059120A (en) * | 2010-11-30 | 2012-06-08 | 한국타이어 주식회사 | Polyurethane foam and pneumatic tire |
| KR101491089B1 (en) * | 2014-06-27 | 2015-02-10 | 주식회사 세림티티시 | Flexible polyurethane foam |
| KR101510023B1 (en) * | 2013-12-26 | 2015-04-07 | 현대자동차주식회사 | Seat-cover with enhanced air permeability and adhesion |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010100234A (en) * | 2000-03-21 | 2001-11-14 | 염규봉 | Flameretardant Polyurethane Foam and Polyol Composition for Preparing the Foam |
| KR20120059120A (en) * | 2010-11-30 | 2012-06-08 | 한국타이어 주식회사 | Polyurethane foam and pneumatic tire |
| KR101510023B1 (en) * | 2013-12-26 | 2015-04-07 | 현대자동차주식회사 | Seat-cover with enhanced air permeability and adhesion |
| KR101491089B1 (en) * | 2014-06-27 | 2015-02-10 | 주식회사 세림티티시 | Flexible polyurethane foam |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101733929B1 (en) * | 2016-08-22 | 2017-05-08 | 주식회사 유엠에스 | Slip-typed Polyurethane Foam and Seat-Cover using the same |
| KR20230023309A (en) * | 2021-08-10 | 2023-02-17 | 대원산업 주식회사 | Integral foaming cover material and manufacturing method thereof |
| KR102554766B1 (en) | 2021-08-10 | 2023-07-13 | 대원산업 주식회사 | Integral foaming cover material and manufacturing method thereof |
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