TWI582144B - The surface of the foam structure - Google Patents

Description

Surface smoothed foam structure

The present invention relates to a foamed structure, and more particularly to a foamed structure having a flat surface.

Polyurethane (PU) is a condensation polymer with a carbamate (-NH(CO)O-) characteristic unit in the main chain, which is composed of isocyanate and polyol. It is a very important material of Minsheng Industrial Materials, which is widely used in transportation, sports equipment, furniture, packaging, fabrics and other fields. In industrial applications, a foaming agent (Foaming Agent) is usually added to react together to form a foam after reacting with an isocyanate to form a carbon dioxide gas. The polyurethane foam has good heat retention, moisture resistance and resistance. The wear resistance is high and it can resist corrosion and aging, and its industrial treatment is easy, and the material properties can be changed with the different raw material formulas. Therefore, it is widely used in daily life and has an inseparable relationship with human life.

Ethylene Vinyl Acetate (EVA) is a polymer material obtained by copolymerizing ethylene and vinyl acetate, which is characterized by controlling the content of vinyl acetate in the copolymer (Vinyl Acetate content, VA content) makes the polymer material good in flexibility and elasticity, especially in low temperature conditions, in addition to its transparency, surface gloss, oxidation resistance and chemical stability. The properties are excellent in polymer materials, especially when applied to the use of foamed products, which have good cushioning, shock resistance, heat insulation and protection. The characteristics of moisture and chemical corrosion are quite practical materials for shoes, building materials, cushions or cushions.

According to the content of Vinyl Acetate (VA) contained in EVA, it can be divided into several categories in the industrial design category: EVA latex such as VA content 60%~90% can be used as adhesive coating and modifier. EVA elastomer with VA content of 40%~60% can be used as toughening agent and auto parts, and EVA resin with the widest application range and VA content 5%~40%, which can be used in the manufacture of film, wire and cable, Foamed products, molded products, hot melt adhesives, etc., are currently the most important copolymer materials in the plastic fiber industry.

However, although various foams are widely used, the foaming reaction threshold is relatively low due to the low foaming reaction threshold of the foams, so that the uniformity of the foaming reaction is not easily controlled, resulting in heating and foaming. The polyurethane foam has a normal surface with minute pores, and the overall structure is uneven. The defect of the surface is uneven, so that the surface of the foam is affected by changes in basic parameters such as density and specific strength, and the physical properties such as surface hardness, tensile strength, elongation and tear strength are accompanied. The reduction, resulting in insufficient resistance to extrusion and abrasion, results in a decrease in the durability of the foam itself.

Furthermore, when processing on the surface of the foam with uneven structure, physical properties such as surface hardness, tensile strength, elongation and tear strength between the surface of the foam and the inner portion of the foam may occur. Differences have an impact on processing quality. Further, when the foamed materials are applied to processed products such as insoles, protective gears, vehicle equipment, athletics trackes, and medical products, the characteristics of the products are changed, and the functions of the appliances are not able to be exhibited or are durable. Insufficient circumstances.

In view of this, how to provide a foamed structure with a smooth surface to make the surface of the foam The nature of the company is stable and can be used as an excellent raw material for processing and building materials.

The main object of the present invention is to provide a foamed structure having a flat surface. The surface of the foamed structure is flat, and the foam layer can be provided with sufficient physical strength when pressed and rubbed to improve product durability.

A secondary object of the present invention is to provide a foamed structure having a smooth surface which is stable in physical properties and can be provided as a processed material of uniform quality.

In order to achieve the above-mentioned various purposes and effects, the present invention discloses a surface-flat foamed structure comprising a foam layer, at least a first bonding layer and a polyurethane film layer. Wherein, the surface of the foam layer comprises at least one hole, and the first bonding layer is coated on the periphery of the foam layer and is combined with the foam layer by molecular crosslinking, and finally the polyurethane film layer And coating the first bonding layer, and bonding to the first bonding layer by molecular crosslinking, filling the hole through the polyurethane film layer to make the surface of the foam layer flat.

In one embodiment of the present invention, the surface-flat foamed structure is further disclosed, further comprising at least one second bonding layer disposed on the first bonding layer and under the polyurethane film layer, and The first bonding layer and the polyurethane film layer are bonded to each other by molecular crosslinking.

In an embodiment of the present invention, the surface of the foamed structure is also disclosed. The material of the foam layer may be a polyurethane foam (PU) or an ethylene-vinyl acetate foam ( Ethylene Vinyl Acetate, EVA), a polyolefin foam (POF), a neoprene foam (Chloroprene rubber, CR) or Ethylene-Propylene-Diene Monomer (EPDM).

In one embodiment of the present invention, the surface-flat foam structure is also disclosed, wherein the material of the first bonding layer or the second bonding layer may be a polyurethane (PU) or a polyaziridine. (Polyaziridine), dispersible polyisocyanate, carbodiimide, Epoxy Silane, Melamine Formaldehyde, Zirconium Salt One or a combination of one of acrylate, monostyrene or diallyl phthalate.

In an embodiment of the present invention, the foamed structure having a smooth surface is disclosed, and the composition of the isocyanate and polyol of the polyurethane film layer can be further composed of the same composition as that of a polyurethane foam. .

11‧‧‧Foam layer

12‧‧‧ holes

21‧‧‧ first bonding layer

22‧‧‧Second bonding layer

31‧‧‧First polyurethane film layer

32‧‧‧Second polyurethane film layer

1 is a cross-sectional view showing a polyurethane foamed structure having a flat surface structure according to a first embodiment of the present invention; and a second embodiment: a polyurethane foamed structure having a flat surface structure according to a second embodiment of the present invention. Fig. 3 is a cross-sectional view showing a polyurethane foamed structure having a flat surface structure according to a third embodiment of the present invention.

In order to provide a better understanding and understanding of the features and the efficacies of the present invention, the preferred embodiment and the detailed description are In the present invention, in view of the technical limitations that the surface structures of various foams cannot be flattened, a foamed structure having a flat surface is provided. By the invention, the physical properties such as surface hardness, tensile strength, elongation and tear strength which are caused by the incomplete structure of the existing various foam bodies can be overcome, and the material of the mat material or the fabric composite material can be overcome. When used, it can provide sufficient physical strength to increase the durability of the product when it faces extrusion and friction. In addition, when processing processed products, the dense structure of the surface structure can provide the physical property consistency required for the processing of the foam, so that the processing quality of the product is stable, and at the same time, the flat foam surface can be upgraded with other building materials. When used, the assembly tightness with other materials improves its applicability and performance.

Therefore, the present invention provides a novel foaming structure which is coated on a conventional foam body with a bonding layer capable of providing molecular crosslinking ability, and the interaction layer provided by the bonding layer facilitates the interaction of the polymerized polymer. A polyurethane film layer is coated on the whole structure, and the pore surface of the foam body is filled by the dense surface structure of the polyurethane film layer, so that the surface thereof is flat.

The following is a description of the technical content, features, and results of the present invention, and may be implemented by the following examples, but the scope of protection of the present invention is not limited thereto.

Referring to the first drawing, a cross-sectional view of a foamed structure having a smooth surface structure according to a first embodiment of the present invention, as shown, provides a foam layer 11 having a surface interspersed with at least one hole 12 The surface structure of the foam layer 11 is rendered uneven. On the outer side of the foam layer 11, a first bonding layer 21 is coated, and the first bonding layer 21 is bonded and bonded to the foam layer 11 by molecular crosslinking, and A first polyurethane film layer 31 is coated on the first bonding layer 21, and is bonded to the first bonding layer 21 by molecular crosslinking, and the hole 12 is filled through the first polyurethane film layer 31. The surface of the foam layer 11 is made flat.

The foam layer provided by the invention is mainly composed of various types of polymerized monomers, supplemented by a foaming agent and other auxiliary agents required for the foaming reaction, and an emulsification reaction and gas escape through polymerization and crosslinking. The condensation foam obtained after the foaming reaction. The polymerizable monomer material of the foam layer may be a polyurethane foam (PU), an ethylene-vinyl acetate foam (EVA), a polyolefin foam (Polyolefin, POF), Chloroprene rubber (CR) or Ethylene-Propylene-Diene Monomer (EPDM). By adjusting the amount of the polymerized monomer material and the related adjuvant, foams of different physical properties can be obtained, and the soft foam having low density and high resilience can be used as a mat material or a fabric composite material, and the heat insulation effect is good. The rigid foam with higher strength can be used as a building material or a heat insulating material.

Wherein, the first bonding layer provided by the invention is made of a polyurethane (PU), a polyaziridine, a dispersible polyisocyanate, and a carbodiimide ( Carbodiimide), Epoxy Silane, Melamine Formaldehyde, Zirconium Salt, Monoacrylate, Monostyrene or Diallyl Phthalate Or a combination of plurals. The materials are formed by interacting with the polymers of various polymer foams to form a network cross-linked structure to achieve a close bond between the polymers. Compared with other types of bonding materials, Provides stronger bond strength and sufficient dispersibility, and is more suitable for joining a plurality of polymer structures.

Further, the polyurethane film layer provided by the present invention is formed by uniformly distributing an isocyanate material and a polyol material according to a demand ratio, and has a polymer structure which can be combined with a bonding material provided by the bridge layer. The combination of molecular cross-linking, and then tightly combined; at the same time, its non-foaming reaction characteristics, can provide a uniform dense planar structure to fill the tiny pores of the surface of the polyurethane foam, thereby providing the polyurethane foam of the present invention. The structure has a flat surface structure.

Next, referring to the second drawing, which is a cross-sectional view of a foamed structure having a flat surface structure according to a second embodiment of the present invention, as shown in the figure, which is a flat surface structure of the first embodiment of the present invention. The polyurethane foaming structure further includes at least one second bonding layer 22 disposed on the first bonding layer 21 and below the first polyurethane film layer 31, and respectively in a molecular crosslinking manner. The bonding layer 21 and the first urethane film layer 31 are bonded.

Therefore, the second embodiment of the present invention provides a polyurethane foam structure having a flat surface structure, which is disposed outside the foam layer 11 having at least one hole 12 dispersed therein, and is coated with a first bonding layer 21, the first combination The layer 21 is combined with the foam layer 11 by molecular crosslinking, and a second bonding layer 22 is coated on the outside of the first bonding layer 21, and is also combined with the first by molecular crosslinking. The layer 21 is bonded and finally has a first polyurethane film layer 31 coated on the first bonding layer 21, and is bonded to the second bonding layer 22 by molecular crosslinking. A polyurethane film layer 31 fills the hole 12 to make the surface of the foam layer 11 flat.

Wherein, the second bonding layer provided by the invention has a material source like the first bonding layer, and is a polyurethane (PU), a polyaziridine, a dispersible polyisocyanate, Carbodiimide, Epoxy Silane, Melamine Formaldehyde, Zirconium Salt, Monoacrylate, Monostyrene or Monophthalic Acid One or a combination of diallyl esters. By providing the second bonding layer between the first bonding layer and the polyurethane film layer, the first bonding layer and the polyurethane film layer structure can be provided, and a stronger bonding structure can be used to make the polyurethane film layer more The entire polyurethane foam structure is tightly coated, and the flatness of the surface structure of the present invention is provided by its dense planar structure.

Next, please refer to the third drawing, which is a cross-sectional view of the polyurethane foamed structure with a flat surface structure according to the third embodiment of the present invention. As shown in the figure, the structural composition is substantially the same as that of the first embodiment. The second urethane film layer 32 provided in the third embodiment has the same composition of isocyanate and polyol as the foam layer 11 made of polyurethane as a foaming material.

Therefore, the third embodiment of the present invention provides a polyurethane foam structure having a flat surface structure, which is provided with a foam layer 11, and the surface of the foam layer 11 is interspersed with at least one hole 12, and the foam layer is The outer side of the 11 is coated with a first bonding layer 21 which is combined with the foam layer 11 by molecular crosslinking, and has a second polyurethane film layer 32, which is isocyanate and The composition of the polyol is the same as that of the foam layer 11, and is coated on the first bonding layer 21, and is bonded to the first bonding layer 21 by molecular crosslinking to pass through the first polyurethane film. The layer 31 fills the hole 12 so that the surface of the foam layer 11 is flat.

The second polyurethane film layer provided by the present invention has the same composition of the isocyanate and the polyol, and has the same composition as the foam layer 11 made of polyurethane as a foaming material. By this structural design, a surface structure and a physical property of the internal foaming structure can be provided, thereby providing the stability required for processing the polyurethane foam when the foaming material is applied, and optimizing the processing of the product. Quality, at the same time, consistent physical properties, will enable the polyurethane foam to be combined with other materials, not only the assembly adhesion is improved, but also the thermal insulation, sound insulation and shockproof performance of the polyurethane foam.

In summary, the present invention provides a foamed structure in which the polyurethane film layer is coated on the polyurethane foam by the molecular crosslinking ability provided by the bridge layer to fill the surface of the foam due to the foaming reaction. The resulting micropores allow the foamed structure to have the characteristics of having a flat surface structure as claimed in the present invention. Through this feature, the physical properties such as surface hardness, tensile strength, elongation and tear strength of the surface of the foamed structure can be reinforced by the prior art, and the polyurethane foam structure is used for processing, processing quality and Product characteristics are stable.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the variations, modifications, and modifications of the shapes, structures, features, and spirits described in the claims of the present invention. All should be included in the scope of the patent application of the present invention.

11‧‧‧Foam layer

12‧‧‧ holes

21‧‧‧ first bonding layer

31‧‧‧First polyurethane film layer

Claims (6)

A surface-flat foamed structure comprising: a foam layer having a surface comprising at least one hole; a first bonding layer coated on the foam layer in a molecular crosslinking manner Bonding with the foam; and a polyurethane film layer coated on the first bonding layer, which is bonded to the first bonding layer by molecular crosslinking, and the hole is filled through the polyurethane film layer The surface of the foam layer is flat. The surface-flat foamed structure according to claim 1, further comprising at least one second bonding layer disposed on the first bonding layer and under the polyurethane film layer, and molecularly crosslinked. Bonding to the first bonding layer and the polyurethane film layer, respectively. The surface-flat foamed structure according to claim 1, wherein the material of the foam layer is selected from the group consisting of a polyurethane foam (PU), an ethylene-vinyl acetate foam (Ethylene). Vinyl Acetate (EVA), a polyolefin foam (POF), a Chloroprene rubber (CR) and an Ethylene-Propylene-Diene Monomer (EPDM) The group formed. The surface-flat foamed structure according to claim 1, wherein the material of the first bonding layer is selected from the group consisting of a polyurethane (PU), a polyaziridine, and a dispersible polymer. Dispersible Polyisocyanate, Carbodiimide, Epoxydecane One of a group consisting of (Epoxy Silane), Melamine Formaldehyde, Zirconium Salt, monoacrylate, monostyrene and diallyl phthalate Or any combination of the above. The surface-flat foamed structure according to claim 2, wherein the material of the second bonding layer is selected from the group consisting of a polyurethane (PU), a polyaziridine, and a dispersible polymer. Isocyanate (dispersible Polyisocyanate), Carbodiimide, Epoxy Silane, Melamine Formaldehyde, Zirconium Salt, Monoacrylate, Monostyrene Any one of the group consisting of diallyl phthalate or any combination of the above. The surface-flat foamed structure according to claim 3, wherein the polyurethane film layer is composed of an isocyanate and a polyol which are further in the same composition as the polyurethane foam.