WO2021118059A1 - Highly functional resin composition for foaming and preparation method therefor - Google Patents

Abstract

The present invention relates to a highly functional resin composition for foaming and a preparation method therefor and, especially, to a highly functional resin composition for foaming and a preparation method therefor, wherein the resin composition can provide high split tear strength and rebound resilience in the manufacture of shoe materials, such as insoles, midsoles, and outsoles.

Description

High-functionality foaming resin composition and method for manufacturing the same

The present invention relates to a high-functional foaming resin composition and a method for manufacturing the same, and high split tear strength when manufacturing shoe materials, for example, insoles, midsoles, outsoles, etc. ) and a high-functional foaming resin composition capable of providing rebound elasticity and a method for manufacturing the same.

Polymer foam refers to a dual state object in which air cells coexist in a solid polymer, and is widely used in various applications such as absorbents, cushioning materials, heat insulating materials, sound absorbing materials, various substrates such as circuit boards, and supports. Textiles and leather, which have been widely used since ancient times, are mostly polymeric and porous materials. The first artificially made foam is a natural rubber latex foam, and synthetic rubber latex has been applied as a raw material for the foam. Recently, various elastic plastic foams such as polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) have been developed, and the types of foams and their foaming technology are being actively studied. In the case of polyolefin foam, it is applied to automobile packaging, construction, marine, medicine, sports, and leisure industries due to its excellent light weight, chemical resistance, shock absorption, heat dissipation and sound insulation. Among them, ethylene vinyl acetate (EVA) is Due to its excellent flexibility, impact strength, transparency, processability, and ozone resistance, it is widely used in the automobile industry and electrical and electronic products. In particular, foam is a cushion material in the footwear industry due to its low specific gravity and soft feel due to its appropriate strength and impact properties. It is widely applied to insoles and midsoles.

In general, the physical properties of the polymer foam are affected by the mechanical properties of the basic resin of the foam and the cell structure such as the open cell content, size, size distribution, and shape. It is influenced by various variables, and many studies are being conducted on it.

For example, Korean Patent No. 10-2017-0081949 discloses a micro-foaming nanocomposite comprising a polymer elastomer, a nanofiller, at least two amphiphilic dispersants, a chemical foaming agent, a foaming accelerator, and a crosslinking agent, and a method for manufacturing the same It is characterized in that it provides improved physical properties of the micro-foamable nanocomposite and can be commercially mass-produced.

In addition, Japanese Patent No. 6026895 discloses a foam resin composition comprising a biodegradable resin containing starch, a polypropylene resin, a soft polymer, and a nucleating agent, and provides a high foaming rate, excellent strength, flexibility and resilience. characterized.

In addition, Japanese Patent Application Laid-Open No. 2013-159632 provides a thermoplastic elastomer composition comprising an ethylene-vinyl acetate copolymer, a diene compound, and an olefin copolymer to provide a foam excellent in flexibility, molding processability, strength, etc. characterized.

As can be seen, the development of a foam composition for providing excellent physical properties is actively in progress, and development research is still needed to provide better physical properties. Accordingly, the present invention was completed to provide a high-functional foaming composition having excellent split tear strength and rebound elasticity by controlling the type and size of the nucleating agent included in the polymer foam.

(Patent Document 1) Korean Patent Publication No. 10-2017-0081949 (2017.07.13)

(Patent Document 2) Japanese Patent Publication No. 6026895 (2016.11.16)

(Patent Document 3) Japanese Patent Application Laid-Open No. 2013-159632 (2013.08.19)

An object of the present invention is to solve all of the above problems.

It is an object of the present invention to provide a high-functional foaming composition having excellent split tear strength and rebound resilience. In particular, it aims to improve mechanical properties by controlling the type and size of the nucleating agent included in the polymer foam.

An object of the present invention is to provide a high-functional foaming composition as a material for footwear.

In order to achieve the object of the present invention as described above and to realize the characteristic effects of the present invention to be described later, the characteristic configuration of the present invention is as follows.

According to an embodiment of the present invention, based on 100 parts by weight of the blend resin, 0.1 to 10 parts by weight of a silica nucleating agent, 0.1 to 5 parts by weight of a crosslinking agent, 1 to 20 parts by weight of a foaming agent, and 1 to 10 parts by weight of a foaming aid. A resin composition for foaming is provided.

According to an embodiment of the present invention, the blend resin is provided including 20 to 80 parts by weight of the olefin-based elastomer based on 20 to 80 parts by weight of the ethylene vinyl copolymer (EVA).

According to an embodiment of the present invention, there is provided a material including the resin composition for foaming, which may be provided as a material for shoes.

According to an embodiment of the present invention, comprising the steps of (a) ethylene vinyl copolymer (EVA) and an olefin-based elastomer, preparing a blend resin; (b) first kneading by adding a silica nucleating agent to the blend resin; (c) secondary kneading including a crosslinking agent, a foaming agent and a foaming aid in the blend resin; a method for producing a resin composition for foaming is provided, including a.

According to an embodiment of the present invention, the manufacturing method is provided by melt blending, and at least one selected from an extruder, a kneader, a Brabender Plasticorder, a mixing roll, and a mixer More can be provided.

According to the resin composition for foaming according to the present invention, it is possible to provide excellent split tear strength and rebound elasticity during foaming. In addition, by providing excellent hardness, density and energy loss coefficient, it can be provided as a material for footwear.

In the case of a shoe material comprising the resin composition for foaming according to the present invention, excellent abrasion resistance, impact resistance and lightness may be provided.

1 shows an SEM photograph of a foamed composition according to Comparative Example 1 of the present invention.

Figure 2 shows an SEM photograph of the foamed composition according to Example 1 of the present invention.

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this is presented as a preferred example of the present invention and cannot be construed as limiting the present invention in any sense.

Content not described here will be omitted because it can be technically inferred sufficiently by a person skilled in the art.

Preparation Example 1: Preparation of a resin composition for foaming

A twin screw extruder (27mmΦ) manufactured by Leistritz was used to prepare the blend resin, and the processing temperature is provided at 140 to 160°C. It is provided with screw speed 200~250 rpm and feeding 8~9kg/h.

After that, a non-reactive nucleating agent is first added at a temperature of 100 to 110° C. in a two roll-mill and first kneaded, and then a crosslinking agent, a foaming agent and a foaming aid are added and kneaded for 5 minutes. A resin composition for foaming was prepared by minimizing the early decomposition of the foaming agent.

Preparation Example 2: Preparation of Foam (Pre-Form) and Phylon

87 g of a resin composition for foaming in the form of a sheet was placed in a corresponding foaming mold, and cross-linked/foamed at 150 kg/cm 2 and 165° C. for 10 minutes to prepare a Pre-Form (foaming ratio of 180%). A 10mm thick specimen for measuring physical properties was prepared in the form of a phylon by cutting the pre-form with a slicer and compressing it. For manufacturing the pylon, the Pre-Form was cut into a size of 80 × 180 × 18 (W × L × H, mm) and placed in a pylon molding mold, heated at 165° C. for 380 seconds, cooled for 380 seconds, and compression-molded to a thickness of 10 mm. .

Example 1

The resin provided in Preparation Example 1 is a blend resin ethylene vinyl copolymer (EVA) 50 parts by weight and ethylene-propylene-diene monomer (EPDM) 50 parts by weight, silica nucleating agent 5 parts by weight, crosslinking agent (DCP) 0.6 parts by weight, 10.4 parts by weight of a foaming agent (JRT-M), and 3 parts by weight of a foaming aid (MB) were provided.

In this case, the nucleating agent was provided as a silica nucleating agent (OCI KONASIL K-300) with a size of 7 to 40 nm.

The resin composition for foaming of Preparation Example 1 was prepared as a Pre-Form according to Preparation Example 2, and the results of experiments according to the Experimental Examples of Table 1 below are shown in Table 2.

Comparative Example 1

A silica nucleating agent (DEUREX S3012M) was provided as a nucleating agent, and the same procedure as in Example 1 was performed except that the size was 12 μm or less.

Comparative Example 2

A silica nucleating agent (DEUREX S3017M) was provided as a nucleating agent, and the same procedure as in Example 1 was performed, except that the size was 17 μm or less.

Comparative Example 3

A silica nucleating agent (ABC Nanotech SILNOS 230) was provided as a nucleating agent, and the same procedure as in Example 1 was performed except that the size was 2 to 4 μm or less.

Comparative Example 4

Calcium carbonate nucleating agent (BUWON B-50 M/B) was provided as a nucleating agent, and the same procedure as in Example 1 was performed except that the size was 50 μm or less.

Comparative Example 5

The same procedure as in Example 1 was performed except that talc (KOCH KC-5000C) was provided as a nucleating agent, and a size of 3.5±0.5 μm was provided.

Comparative Example 6

The same procedure as in Example 1 was performed except that talc (KOCH KCNAP-400) was provided as a nucleating agent, and the size was 11.0±2.0 μm.

Examples 2 to 6

Example 2 is 0.1 parts by weight of the nucleating agent, Example 3 is 0.3 parts by weight, Example 4 is 0.7 parts by weight of the nucleating agent, Example 5 is 1 part by weight of the nucleating agent, Example 6 is 3 parts by weight of the nucleating agent It proceeded in the same manner as in Example 1, except that parts were included.

Comparative Example 7

It proceeded in the same manner as in Example 1, except that the nucleating agent was not included.

Experimental example: physical property evaluation

Forms (Pre-Form) and phylons prepared according to the Examples and Comparative Examples were evaluated for physical properties as shown in Table 1 below.

Looking at Table 2, which is the result according to the physical property evaluation of Table 1, in the case of Example 1, in which the size of the silica nucleating agent is 7 to 40 nm, the cell morphology is changed during foam formation to form microbubbles It can be confirmed that the mechanical properties of the foam (foam) are improved accordingly.

Referring to Table 3, it can be seen that the split tear strength (STS) increases as the amount of nano-sized silica nucleating agent is included in the measured values of the physical properties of the phylon for each nucleating agent content, but rather the rebound elasticity decreases. Therefore, it can be confirmed that the case of Example 3, which provides an appropriate split tear strength (STS) of 2.0 kgf/cm or more, and is excellent in both rebound elasticity and energy loss coefficient, is the most optimized value.

That is, through the experimental results, the particle size has the greatest effect on the nucleating effect, and the nucleating effect is improved due to the large specific surface area of the nucleating agent of the nano-sized particles, and thus the split tear strength is provided as a foam having fine cells is provided. (STS) At the same time, it was confirmed that it was possible to provide a foaming composition having excellent rebound elasticity and excellent elasticity and hardness.

Accordingly, it is possible to provide a high-functional composition having excellent split tear strength and rebound resilience by providing the foaming composition according to the present invention, and it can be confirmed that it is applied as a material for shoes.

In the above, the present invention has been described by specific matters such as specific components and limited embodiments, but these are provided to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments, and the present invention is not limited to the above embodiments. Those of ordinary skill in the art to which the invention pertains can devise various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the above-described embodiments, and not only the claims described below, but also all modifications equivalently or equivalently to the claims described below belong to the scope of the spirit of the present invention. will do it

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The detailed description of the present invention set forth below refers to, by way of illustration, specific embodiments in which the present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different but need not be mutually exclusive. For example, certain shapes, structures, and characteristics described herein with respect to one embodiment may be embodied in other embodiments without departing from the spirit and scope of the invention. In addition, it should be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description set forth below is not intended to be taken in a limiting sense, and the scope of the invention, if properly described, is limited only by the appended claims, along with all scope equivalents to those claimed.

Hereinafter, in order to enable a person of ordinary skill in the art to easily practice the present invention, it will be described in detail with reference to preferred embodiments of the present invention.

According to the present invention, a resin composition for high-functionality foaming and a method for manufacturing the same are provided.

According to an embodiment of the present invention, the blend resin includes an ethylene vinyl copolymer (EVA) and an olefin-based elastomer.

According to an embodiment of the present invention, the blend resin is provided including 80 to 20 parts by weight of the olefin-based elastomer based on 20 to 80 parts by weight of the ethylene vinyl copolymer (EVA). When the proportion of the olefin-based elastomer in the blend resin is less than 20 parts by weight, the crystallinity of the resin increases and the elasticity of the resin decreases. there is a problem.

The ethylene vinyl copolymer (ethylene-vinyl acetate, EVA) of the present invention refers to a polymer obtained by copolymerizing ethylene and vinyl acetate monomers, and is generally based on the basic properties of polyethylene products made of ethylene monomers. It has the added properties of vinyl acetate. Compared to the ethylene monomer, the vinyl acetate monomer contains an acetoxy group, and as this content increases, it provides a polar property. As the content of vinyl acetate increases, the optical properties (glossiness) improve, the density increases, but the crystallinity decreases and flexibility increases. In addition, the crosslinking reactivity using a crosslinking agent in the blend resin is affected by the molecular structure, and the more functional groups, the greater the crosslinking reactivity.

The ethylene acetate copolymer (EVA) is characterized in that the content of vinyl acetate (VA) is 10 to 50% by weight. If the content is less than 10% by weight, there is a problem in processing difficult, and if it exceeds 50% by weight, there is a disadvantage in crystallinity. In addition, the greater the content of acetoxy in the ethylene vinyl copolymer, the better the crosslinking reactivity. However, if the content is too large, control to prevent crosslinking in the process is required, so the above range is most preferable.

In the case of the ethylene vinyl copolymer (EVA), the melt flow index may be provided from 1 to 10, the degree of analysis method is Melt Index, and the unit is provided in g/10min. If the melt flow index is less than 1, there may be a problem that the time required for the reaction is increased due to a decrease in flowability, and if it exceeds 10, there may be a problem in that elasticity and restoring force are deteriorated.

The olefin-based elastomer of the present invention may be provided for the purpose of maintaining the melt strength of the resin during foaming of the resin composition. In this case, the olefin-based elastomer has a Mooney viscosity of 25 to 75 based on 125°C. Mooney viscosity is a value indicating the viscosity of rubber and is known to affect the processability of rubber and the physical properties of rubber after vulcanization. By providing the olefin-based elastomer satisfying the above ranges, it is possible to prevent a problem of deterioration in foaming processability due to high melt tension in foaming, and to provide excellent flexibility and processability.

According to an embodiment of the present invention, the melt index (MI) of the olefin-based elastomer is provided as 0.1 to 30 g/10min at 2.16Kg at 190°C based on ASTM D1238, and the weight average molecular weight of the olefin-based elastomer is 10,000 to 800,000 It is given in g/mol.

According to an embodiment of the present invention, the olefin-based elastomer is _{provided including at least one selected from C 2} to C ₂₀ α-olefin and ethylene-propylene-based copolymer rubber. In the case of the C ₂ to C ₂₀ α-olefin, ethylene may be preferably provided, and in this case, ethylene may be included in an amount of 40 to 90 wt%. When the range of ethylene is included in the range of 40 to 90% by weight, hard segments may be appropriately provided to provide excellent strength and moldability.

According to an embodiment of the present invention, the ethylene-propylene-based copolymer rubber may include at least one selected from ethylene-propylene rubber (EPR) and ethylene-propylene-diene monomer (EPDM), preferably may be provided with ethylene-propylene-diene monomer (EPDM).

According to an embodiment of the present invention, the ethylene-propylene-diene monomer (EPDM) is provided including ethylene, propylene and ethylidene norbornene (ENB). In this case, 40 to 80% by weight of ethylene, 10 to 50% by weight of propylene and 0.5 to 10% by weight of ethylidenenorbornene are provided.

According to an embodiment of the present invention, based on 100 parts by weight of the blend resin, 0.1 to 10 parts by weight of the silica nucleating agent, 0.1 to 5 parts by weight of a crosslinking agent, 1 to 20 parts by weight of a foaming agent, and 1 to 10 parts by weight of a foaming aid There is provided a resin composition for foaming comprising.

In more detail, the blend resin may be provided by including 80 to 20 parts by weight of an olefin-based elastomer based on 20 to 80 parts by weight of the ethylene vinyl copolymer (EVA), preferably 40 to 60 parts by weight of the ethylene vinyl copolymer (EVA). Based on parts by weight, ethylene-propylene-diene monomer (EPDM) is provided in an amount of 60 to 40 parts by weight, thereby providing sufficient foaming of the foam and providing excellent elasticity and restoring force of the foamed composition.

In particular, according to an embodiment of the present invention, based on 100 parts by weight of the blend resin, 0.1 to 10 parts by weight of the silica nucleating agent may be included, and preferably 0.1 to 5 parts by weight. In view of the results of Table 3 of Examples to be described later, it can be seen that the physical properties of the phylon prepared by the foaming composition containing 0.1 to 5 parts by weight of the silica nucleating agent are improved overall. In particular, excellent abrasion resistance and impact resistance can be expected in view of split tear strength (STS), rebound elasticity, and energy loss coefficient, and excellent lightness can be expected in view of hardness and density values.

According to an embodiment of the present invention, the silica nucleating agent is fumed silica, fused silica, precipitated silica, silica gel, colloidal silica, and It is provided including at least one selected from crystalline silica, and preferably fumed silica may be provided. In light of the results of Table 2 of Examples to be described later, when the silica nucleating agent is provided in a nano size, excellent physical properties can be provided when forming the foam of the foaming composition, and in particular, split tear strength (STS) and It is possible to provide a foaming composition having excellent rebound elasticity and excellent hardness at the same time.

According to an embodiment of the present invention, the silica nucleating agent is characterized in that the average particle diameter is 1 to 50 nm, preferably, the range of 7 to 40 nm is provided.

In general, the smaller the particle size of the nucleating agent, the larger the specific surface area (BET), and the larger the specific surface area, the stronger the nucleating effect and the more microbubbles are generated. When the micro-bubbles are uniformly generated, the mechanical properties of the foam are improved during foaming. Therefore, in order to provide uniform microbubbles, the silica nucleating agent is provided at 7 to 40 nm to change the cell morphology to form microbubbles and to improve the mechanical properties of the foam. . In the case of less than 7 nm, as the specific surface area increases and the surface energy increases, SiO ₂ The above range is preferable in that aggregation problem may occur and it is difficult to provide uniform microbubbles when it exceeds 40 nm. In light of the results of Table 3 described below, it can be confirmed that the mechanical properties of the foam are improved according to the size of the nucleating agent.

According to one embodiment of the present invention, the crosslinking agent may be provided with an organic peroxide, typically a dialkyl organic peroxide may be provided. For example, 1,1-di-t-butyl peroxy-3,3,5-trimethylcyclohexane, t-butyl-cumyl peroxide, dicumyl-peroxide (DCP), 2,5-dimethyl-2 At least one selected from ,5-di(t-butyl-peroxyl)hexane and 1,3-bis(t-butyl-peroxyl-isopropyl)benzene may be provided, and preferably dicumyl-per Oxide (DCP) may be provided.

In particular, the peroxide contained in the organic peroxide is activated to initiate the crosslinking process by extracting hydrogen atoms from the polymer backbone and providing a site for crosslinking. The foam can be crosslinked in this way during the foaming process to provide an expanded molded article with improved physical properties. In particular, the crosslinking agent can impart desirable viscoelasticity for foaming. In addition, for cross-linking foaming, it is preferable that the ethylene vinyl copolymer (EVA) first undergo cross-linking by decomposition of the cross-linking agent, and after obtaining appropriate viscoelasticity, the foaming agent decomposes to form bubbles. The expansion ratio is basically determined by the amount of the foaming agent added, and since the elasticity of the ethylene vinyl copolymer (EVA) is largely involved in the formation of bubbles, in the case of a crosslinking agent, 0.1 to 5 parts by weight of the crosslinking agent is included with respect to 100 parts by weight of the blend resin. In this case, it is possible to provide desirable physical properties of the final product.

According to an embodiment of the present invention, the foaming agent is an additive provided to include bubbles in a resin including rubber or plastic, and the chemical foaming agent may be an organic foaming agent. For example, the organic foaming agent is provided including at least one selected from azodicarbonamide, dinitrosopentamethylenetetramine, and p,p'-oxybisbenzenesulfonylhydrazide, preferably Azodicarbonamide may be provided, and modified azodicarbonamide may be provided. For example, commercially obtainable JTR-M can be provided.

In addition, by including 1 to 20 parts by weight of a foaming agent with respect to 100 parts by weight of the blend resin, it is possible to provide physical properties such as lightness, buffering property, and heat insulation, and in particular, when applied to a shoe material, the impact generated during strenuous exercise or walking may serve to absorb In addition, in the case of the foaming agent, if the decomposition temperature is less than 130 ℃, there is a problem that foaming proceeds at the initial stage of the reaction, and if it exceeds 200 ℃, the foaming time takes too long and there is a problem in productivity. it is preferable

According to an embodiment of the present invention, the foaming aid is a metal oxide, and may be provided by including at least one selected from zinc oxide, calcium oxide, magnesium oxide, tin oxide, cadmium oxide and lead oxide, preferably Alternatively, zinc oxide may be provided. By including 1 to 10 parts by weight of the foaming aid with respect to 100 parts by weight of the blend resin, the foaming rate of the resin composition can be adjusted, the foaming rate can be improved, and the foaming density inside the foaming layer can be adjusted. For example, BUWON's B-50 ZnO M/B may be provided.

According to one embodiment of the present invention, in addition to the foaming agent and foaming aid, if it can affect the formation of bubbles in the resin, a foaming accelerator and a surfactant may be additionally added, and, if necessary, a stabilizer, antioxidant The physical properties can be controlled by including at least any one selected from an agent, a filler, and a colorant, but of course, it is not limited thereto.

According to an embodiment of the present invention, there is provided a material comprising a resin composition for foaming. In the case of the material, it can be applied to an electrical component material, a mechanical component material, an automobile component material, a building material, a packaging material, and the like, and is preferably applied to a material for footwear. It can be applied to the midsole and insole that require ultra-lightweight, and it can be applied to the upper and outsole that require abrasion resistance and shock absorption, as well as being provided in a variety of ways, such as heels and slipper soles. may, but is not limited thereto.

On the other hand, according to an embodiment of the present invention, (a) including the ethylene vinyl copolymer (EVA) and the olefin-based elastomer resin, comprising the steps of preparing a blend resin; (b) first kneading by adding a silica nucleating agent to the blend resin; (c) secondary kneading including a crosslinking agent, a foaming agent and a foaming aid in the blend resin; a method for producing a resin composition for foaming is provided, including a. In this case, the manufacturing method is provided as a melt blending method. Hereinafter, in the case of the composition included in the manufacturing method, the same contents may be applied to the above-described resin composition and formulation, and the description within the overlapping range will be omitted.

According to an embodiment of the present invention, the blend resin in step (a) is provided including 20 to 80 parts by weight of an olefin-based elastomer based on 20 to 80 parts by weight of the ethylene vinyl copolymer (EVA). In addition, the olefin-based elastomer _{may be provided including at least one selected from C 2} to C ₂₀ α-olefin and ethylene-propylene-based copolymer rubber. In this case, the ethylene-propylene-based copolymer may be included. Preferably, based on 40 to 60 parts by weight of the ethylene vinyl copolymer (EVA), it is provided including 60 to 40 parts by weight of ethylene-propylene diene monomer (EPDM). In this case, 40 to 80% by weight of ethylene, 10 to 50% by weight of propylene and 0.5 to 10% by weight of ethylidenenorbornene are provided.

According to an embodiment of the present invention, based on 100 parts by weight of the blend resin in step (b), 0.1 to 10 parts by weight of a silica nucleating agent is included, and the silica nucleating agent is provided with an average particle diameter of 1 to 50 nm, Preferably 7 to 40 nm may be included. The description of the content and size of the silica nucleating agent is the same as described above.

According to an embodiment of the present invention, in step (b), a silica nucleating agent is added, and the first kneading step may be performed at 100°C to 150°C. Preferably, it may be provided at 100° C. to 110° C., and it is preferable to add the non-reactive nucleating agent first compared to other additional compositions.

According to an embodiment of the present invention, with respect to 100 parts by weight of the blend resin in step (c), the secondary kneading is performed including 0.1 to 5 parts by weight of a crosslinking agent, 1 to 20 parts by weight of a foaming agent, and 1 to 10 parts by weight of a foaming aid. steps are provided. In the case of temperature, it is provided in the same manner as in step (b), and may be performed for 5 to 15 minutes.

According to an embodiment of the present invention, the melt blending method refers to making a new material by mechanical force after melting by applying heat above the melting temperature of the polymer materials to be blended, and in the case of the present invention, the resin It can be compressed after melting at the melting temperature.

According to an embodiment of the present invention, the blending is provided using at least one selected from an extruder, a kneader, a Brabender Plasticorder, a mixing roll, and a mixer. do.

According to an embodiment of the present invention, in the case of the extruder, a melt extruder is preferably provided, and the process can be performed by optimizing the process conditions according to various raw materials to be input in the melting process. In the melting process, a melting temperature of 100°C to 300°C may be provided, and preferably 150°C to 230°C may be provided. At this time, the melt flow index is about 0.1 to 60. The analysis method is Melt Index, and the unit is g/10min.

According to an embodiment of the present invention, the extruder may be provided with any one selected from a single screw extruder, a twin screw extruder, a single screw and a twin screw extruder, and preferably a twin screw compressor may be provided.

Claims (21)

With respect to 100 parts by weight of the blend resin, 0.1 to 10 parts by weight of a silica nucleating agent, 0.1 to 5 parts by weight of a crosslinking agent, 1 to 20 parts by weight of a foaming agent, and 1 to 10 parts by weight of a foaming aid. According to claim 1, The blend resin is a resin composition for foaming comprising 80 to 20 parts by weight of an olefin-based elastomer based on 20 to 80 parts by weight of an ethylene vinyl copolymer (EVA). According to claim 1, The blend resin is an ethylene-vinyl copolymer (EVA) 40 to 60 parts by weight, ethylene-propylene diene monomer (EPDM) 60 to 40 parts by weight of the foaming resin composition comprising. 3. The method of claim 2, The olefin-based elastomer is _{a resin composition for foaming comprising at least one selected from C 2} to C ₂₀ α-olefin and ethylene-propylene-based copolymer rubber. 5. The method of claim 4, The ethylene-propylene-based copolymer rubber is an ethylene-propylene rubber (EPR) and an ethylene-propylene-diene monomer (EPDM) for foaming resin composition comprising at least one selected from the group consisting of. 6. The method of claim 5, The ethylene-propylene-diene monomer (EPDM) is a foaming resin composition comprising 40 to 80% by weight of ethylene, 10 to 50% by weight of propylene, and 0.5 to 10% by weight of ethylidene norbornene. 3. The method of claim 2, The olefin-based elastomer is a resin composition for foaming having a Mooney viscosity of 10 to 100 based on 125°C. According to claim 1, The silica nucleating agent is a resin composition for foaming having an average particle diameter of 1 to 50 nm. According to claim 1, The silica nucleating agent is a foaming resin composition comprising at least one selected from fumed silica, fused silica, precipitated silica, silica gel, colloidal silica, and crystalline silica. According to claim 1, The crosslinking agent is 1,1-di-t-butyl peroxy-3,3,5-trimethylcyclohexane, t-butyl-cumyl peroxide, dicumyl-peroxide (DCP), 2,5-dimethyl-2, A resin composition for foaming comprising at least one selected from 5-di(t-butyl-peroxyl)hexane and 1,3-bis(t-butyl-peroxyl-isopropyl)benzene. According to claim 1, The foaming agent is a resin composition for foaming comprising at least one selected from azodicarbonamide, dinitrosopentamethylenetetramine, p,p'-oxybisbenzenesulfonylhydrazide. According to claim 1, The foaming aid is a resin composition for foaming comprising at least one selected from zinc oxide, calcium oxide, magnesium oxide, tin oxide, cadmium oxide and lead oxide. A material comprising the resin composition for foaming according to any one of claims 1 to 12. 14. The method of claim 13, The material is a material comprising a resin composition for foaming that can be provided to at least one selected from an electrical component material, a mechanical component material, an automobile component material, a building material, a packaging material, and a shoe material. (a) including an ethylene vinyl copolymer (EVA) and an olefin-based elastomer, preparing a blend resin; (b) first kneading by adding a silica nucleating agent to the blend resin; and (c) secondary kneading including a crosslinking agent, a foaming agent and a foaming aid in the blend resin; Method for producing a resin composition for foaming comprising. 16. The method of claim 15, The blend resin in step (a) is a method for producing a foaming resin composition comprising 20 to 80 parts by weight of an olefin-based elastomer based on 20 to 80 parts by weight of an ethylene vinyl copolymer (EVA). 16. The method of claim 15, A method of producing a resin composition for foaming comprising 0.1 to 10 parts by weight of a silica nucleating agent based on 100 parts by weight of the blend resin in step (b). 16. The method of claim 15, In step (b), the silica nucleating agent has an average particle diameter of 1 to 50 nm. 16. The method of claim 15, The step (b) is a method of manufacturing a resin composition for foaming which is carried out at 100 °C to 150 °C. 16. The method of claim 15, Based on 100 parts by weight of the blend resin in step (c), 0.1 to 5 parts by weight of a crosslinking agent, 1 to 20 parts by weight of a foaming agent, and 1 to 10 parts by weight of a foaming aid. 16. The method of claim 15, The manufacturing method is melt blending extruder, kneader (Kneader), Brabender plastic order (Brabender Plasticorder), mixing roll (Mixing Roll) and a method of manufacturing a resin composition for foaming providing at least one selected from a mixer .

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