KR20220147898A - Foaming composition, method for preparing crosslinked foaming composition and foam comprising the same - Google Patents

Abstract

The present invention relates to a composition for foaming, a method for preparing a composition for crosslinked foaming using the same, and a foam comprising the same. More specifically, the composition includes: 50 to 90 wt% of a thermoplastic resin; 5 to 40 wt% of a foaming agent; and 0.5 to 10 wt% of a resin mixture for foaming. The resin mixture for foaming includes: 5 to 40 wt% of an alkoxysilyl acrylate compound; 20 to 60 wt% of a trifunctional acrylic monomer, 1 to 15 wt% of urushiol, and 1 to 50 wt% of a cyanurate compound. It is possible to provide a non-crosslinked foam having excellent physical properties.

Description

A composition for foaming, a method for producing a composition for crosslinking foaming using the same, and a foam comprising the same

The present invention relates to a foaming composition, a method for producing a crosslinked foaming composition using the same, and a foam comprising the same, and in more detail, a foaming composition capable of producing a foam having high strength physical properties, a method for preparing the same, and a foam comprising the same is about

In general, foams are produced using either a no-crosslinking process or a crosslinking process. The non-crosslinking process is a method of manufacturing a foam by melting and extruding a volatile solvent and an inorganic foaming agent together with a resin composition under high temperature and/or high pressure. On the other hand, the crosslinking process is a method of producing a foam by extruding a resin composition and then crosslinking it in various ways. That is, the crosslinking process is different from the non-crosslinking process in that foaming conditions are obtained by adjusting the degree of crosslinking of the resin during foaming.

Foams produced through such a non-crosslinking process or a crosslinking process are used in various fields. In particular, the foam applied to automobile interior materials exhibits vehicle weight reduction and appropriate strength, and is manufactured by foaming after passing through an electron beam crosslinking or chemical crosslinking process in order to increase the melt viscosity of the resin composition. Such a crosslinking process causes problems such as the need for a pretreatment operation, an increase in manufacturing cost, and a decrease in productivity. On the other hand, ADCA (azodicarbonamide), a representative chemical foaming agent used in the chemical crosslinking foaming process, is decomposed by thermal decomposition at high temperature to generate gases such as nitrogen, ammonia, carbon dioxide, and carbon monoxide. These gases are harmful and have the disadvantage of causing problems such as corrosion in the equipment during the process.

On the other hand, in the case of a non-crosslinked foam sheet, it is mainly prepared by using a gas such as butane, propane, alcohol, carbon dioxide, or nitrogen as a foaming agent. The foaming agent is uniformly mixed with the resin in a supercritical state of high temperature and high pressure during the extrusion process to proceed with the foaming process. In the case of such a foaming agent, since a foam is formed using mostly harmless carbon dioxide, water, alcohol, etc., the problem of a foaming agent such as ADCA can be solved. However, in order for this non-crosslinked foamed product to be applied as an industrial material, a secondary thermoforming process must be performed. There is a problem, and when moisture is mixed in the resin, the extrusion load is excessive, or the foaming cell is easily opened, when the resin density is high, the aging time may be delayed. Due to the difficulty of this, it is not currently applied as an industrial material. For example, Korean Patent Registration No. KR 10-2127944 discloses a non-crosslinked olefin-based resin composition, a foam using the same, and a method for manufacturing the same.

Accordingly, if a technology related to a non-crosslinked foam having excellent foamability and excellent physical properties is provided, it is expected to be widely applied in related fields.

Accordingly, one aspect of the present invention is to provide a foaming composition capable of providing a non-crosslinked foam having excellent physical properties.

Accordingly, another aspect of the present invention is to provide a method for preparing a composition for crosslinking foaming that can provide a non-crosslinked foam having excellent physical properties.

Accordingly, another aspect of the present invention is to provide a composition for crosslinking foaming that can provide a non-crosslinked foam having excellent physical properties.

Another aspect of the present invention is to provide a foam excellent in foamability and physical properties, including the composition for foaming of the present invention.

According to one aspect of the present invention, it comprises 50 to 90% by weight of a thermoplastic resin, 5 to 40% by weight of a foaming agent, and 0.5 to 10% by weight of a resin mixture for foaming, wherein the resin mixture for foaming is an alkoxysilyl-based acrylate compound 5 To 40% by weight, trifunctional (trifunctional) acrylic monomer 20 to 60% by weight, urushiol 1 to 15% by weight and 1 to 50% by weight of a cyanurate-based compound is provided a foaming composition comprising.

According to another aspect of the present invention, the step of providing the composition for foaming; obtaining a molded article by molding the composition for foaming; and irradiating an electron beam to the molded product.

According to another aspect of the present invention, there is provided a composition for crosslinking foaming prepared by the method for preparing the composition for crosslinking foaming.

According to another aspect of the present invention, there is provided a foam comprising the composition for crosslinking foaming in an amount of 1 to 10 parts by weight per 100 parts by weight of a thermoplastic olefin (TPO)-based base resin.

The foam using the composition for foaming of the present invention has excellent properties such as flexural strength and foamability, and thus can be applied to foamed products requiring high heat resistance, cold resistance, impact strength, lightness, and the like.

1 is a measurement of the gel fraction (%) in order to check the degree of crosslinking of the composition for crosslinking foaming according to the composition of the composition for foaming and the dose of electron beam, and FIG. 1(a) shows the composition for foaming of the present invention. It shows the results in the case of not including, Figure 1 (b) shows these results and the results in the case of including the composition for foaming of the present invention together.
2 is a flexure stress analysis result (FIG. 2(a)), flexure strain analysis result (FIG. 2(b)), and Young's modulus of the foam using the foaming composition of Examples and Comparative Examples; (Young's modulus) analysis results (FIG. 2(c)) are shown, respectively.
3 shows the results of analyzing the morphological characteristics of foams using the foaming compositions of Examples and Comparative Examples with an SEM instrument.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

According to the present invention, a composition for foaming capable of providing an excellent non-crosslinked foam is provided, and when a non-crosslinked foam is produced using the foaming composition of the present invention and excellent in foamability, physical properties such as flexural strength are improved, , furthermore, it is possible to control the physical properties of the foam according to the composition of the composition for foaming of the present invention.

The foaming composition of the present invention comprises 50 to 90% by weight of a thermoplastic resin, 5 to 40% by weight of a foaming agent, and 0.5 to 10% by weight of a foaming resin mixture, wherein the foaming resin mixture is an alkoxysilyl-based acrylate compound 5 to 40% by weight, 20 to 60% by weight of a trifunctional acrylic monomer, 1 to 15% by weight of urushiol, and 1 to 50% by weight of a cyanurate-based compound.

When the foaming agent is included in an amount of less than 5% by weight based on the total weight of the composition for foaming, the foaming effect may be insufficient. there may be Preferably, the foaming agent may be included in an amount of 10 to 30% by weight, for example, 10 to 25% by weight based on the total weight of the foaming composition.

Based on the total weight of the foaming composition, if the foaming resin mixture is included in less than 0.5% by weight, the effect of improving the properties of the foam may be insufficient, and if it exceeds 10% by weight, excessive coating when mixing the polymer and the foaming agent Due to this, there may be a problem of inhibiting a uniform crosslinking reaction. Preferably, the foaming resin mixture may be included in an amount of 1 to 8% by weight based on the total weight of the foaming composition, for example, 1 to 5% by weight based on the total weight of the foaming composition.

On the other hand, the composition for foaming includes, for example, the thermoplastic resin in an amount of 50 to 90% by weight based on the total weight of the composition for foaming, including the remainder of the thermoplastic resin. Preferably, the thermoplastic resin may be included in an amount of 60 to 85% by weight, for example, 70 to 80% by weight based on the total weight of the foaming composition.

The thermoplastic resin is at least selected from the group consisting of polyethylene resin, polypropylene resin, polyvinyl chloride resin, polystyrene resin, methacrylic resin, polycaprolactone resin, polylactide resin, polyvinyl alcohol resin, and polyvinylene chloride resin. It may be one, and preferably a polyethylene resin, a polypropylene resin, or a mixture thereof.

The blowing agent may be at least one selected from the group consisting of sodium bicarbonate, ammonium carbonate, and amyl acetate, preferably sodium bicarbonate.

The foaming resin mixture contained in the foaming composition of the present invention is 5 to 40% by weight of an alkoxysilyl-based acrylate compound, 20 to 60% by weight of a trifunctional acrylic monomer, 1 to 15% by weight of urushiol, and cyanu 1 to 50% by weight of the rate-based compound.

When the alkoxysilyl-based acrylate compound is included in an amount of less than 5% by weight based on the total weight of the resin mixture for foaming, there is a problem that the crosslinking rate is small when irradiated with electron beams, so there is an insufficient effect on the improvement of physical properties, and when it exceeds 40% by weight There may be a problem of inhibiting the uniform crosslinking reaction due to excessive coating when mixing the polymer and the foaming agent. Preferably, the resin mixture for foaming may be included in an amount of 9 to 36% by weight based on the total weight of the resin mixture.

The alkoxysilyl-based acrylate compound is a monomer of 3-(trimethoxysilyl)propyl methacrylate (TMPMA), 3-(trimethoxysilyl)propyl acrylate, 3-[diethoxy(methyl)silyl]propylmeth Acrylate, 3-[dimethoxy (methyl) silyl] propyl acrylate, [dimethoxy (methyl) silyl] methyl methacrylate, 3- [tris (trimethylsilyloxy) silyl] propyl methacrylate, 3- [dimethacrylate The group consisting of oxy(methyl)silyl]propylmethacrylate, 3-(methoxydimethylsilyl)propylacrylate, 3-(triethoxysilyl)propylmethacrylate and (triethoxysilyl)methylmethacrylate It may be at least one selected from, preferably 3- (trimethoxysilyl) propyl methacrylate (TMPMA).

When the trifunctional acrylic monomer is included in an amount of less than 20% by weight based on the total weight of the resin mixture for foaming, there is a problem in that sufficient improvement in physical properties is not obtained, and when it exceeds 60% by weight, the polymer and the foaming agent are mixed There may be a problem of inhibiting a uniform crosslinking reaction due to excessive coating. Preferably, the trifunctional acrylic monomer may be included in an amount of 30 to 50% by weight based on the total weight of the resin mixture.

The trifunctional acrylic monomer is trimethylolpropane trimethacrylate (TMPTMA), glycerol trimethacrylate (GTMA), 1,6-hexanediol dimethacrylate, 4,4'-isopropylidenedi Phenol dimethacrylate, neopentylglycol dimethacrylate, neopentylglycol diacrylate, nonamethyleneglycol dimethacrylate, pentaerythritol tetraacrylate and tris(2-acryloyloxyethyl)isocyanu It may be at least one selected from the group consisting of lactate, preferably trimethylolpropane trimethacrylate (TMPTMA).

When urushiol is included in an amount of less than 1% by weight based on the total weight of the resin mixture for foaming, there is a problem that sufficient improvement in physical properties is not obtained. there may be a problem with Preferably, the urushiol may be included in an amount of 5 to 10% by weight, for example, 6 to 9% by weight, based on the total weight of the resin mixture.

When the cyanurate-based compound is included in an amount of less than 1% by weight based on the total weight of the resin mixture for foaming, sufficient crosslinking is not obtained and there is an insufficient problem in improving physical properties. There may be a problem in that molding processability is lowered due to an increase in the degree of crosslinking. Preferably, the cyanurate-based compound may be included in an amount of 10 to 40 wt% based on the total weight of the resin mixture.

The cyanurate-based compound is triallyl isocyanurate (TAIC), trimethylolpropane triacrylate (TMPTA), hexanediol diacrylate (hexandiol diacrylate, HDDA), triaryl cyanurate (triallyl cynurate, TAC) and tripropylene glycol diacrylate (tripropylene glycol diacry late, TPGDA) may be at least one selected from the group, preferably triallyl isocyanurate (triallyl isocyanurate, TAIC) will be.

The composition for foaming of the present invention is preferably included in the pre-foam composition, which is a foam before foaming, in the form of a cross-linked foaming composition.

The method for preparing the composition for crosslinking foaming of the present invention comprises the steps of preparing the composition for foaming of the present invention; obtaining a molded article by molding the composition for foaming; and irradiating an electron beam to the molding.

The step of obtaining the molding may be performed by extrusion molding at a temperature of 180 to 230°C, and the extrusion molding is interpreted as including injection molding, preferably performed at a temperature of 180 to 230°C, , More preferably, it is carried out at a temperature of 180 to 220 ℃. When the extrusion molding temperature is less than 180 ° C., smooth molding tends to be difficult due to insufficient fluidity, and when it is more than 230 ° C., a problem of carbonization may occur.

When an extrudate is produced by extrusion molding, the step of subsequently cooling and cutting the extrudate may be additionally performed. In this case, the cooling method may be, for example, natural cooling or cooling by cooling water, but is not particularly limited thereto. However, the cooling is preferably performed at a temperature of 40 to 80 ℃, preferably 40 to 70 ℃, and when the cutting is performed at less than 40 ℃, the cutting is performed smoothly due to excessive strength There is a problem that it is difficult to become, and when it is carried out at more than 80° C., the viscosity increases, so that the cutting is not made clean and there is a problem of sticking to the cutter.

Subsequently, the step of irradiating an electron beam to the molded product obtained as described above is performed, wherein the electron beam may be irradiated with a total dose of 10 to 200 kGy, preferably 20 to 100 kGy, for example 40 to 60 kGy.

A composition for cross-linked foaming can be prepared by such a method for preparing a composition for cross-linked foaming.

The composition for crosslinked foaming of the present invention is mixed with the pre-foam composition, and a foam excellent in foamability and physical properties can be obtained by foaming.

The foam of the present invention preferably includes the composition for crosslinking foaming in an amount of 1 to 10 parts by weight per 100 parts by weight of a thermoplastic olefin (TPO)-based base resin. When the composition for crosslinking foaming is included in an amount of less than 1 part by weight per 100 parts by weight of a thermoplastic olefin (TPO)-based base resin, foaming and improvement of physical properties may be insufficient. There may be problems in the formation of open pores and deterioration of physical properties due to this.

The thermoplastic olefin (Thermoplastic Olefin, TPO)-based base resin may be at least one selected from the group consisting of polypropylene homopolymer, polypropylene random copolymer, polypropylene block copolymer and alpha olefin elastomer, for example, The thermoplastic olefin-based base resin is a mixture of a polypropylene homopolymer and a polypropylene block copolymer, and preferably, the thermoplastic olefin-based base resin is a polypropylene homopolymer and a polypropylene block copolymer in a weight ratio of 2 to 4: 1, for example. For example, it may be a mixed resin mixed in a ratio of 3:1.

In order to obtain the foam as described above, the pre-foam composition comprising the composition for cross-linked foaming of the present invention in an amount of 1 to 10 parts by weight per 100 parts by weight of a thermoplastic olefin (TPO)-based base resin is obtained through addition-crosslinking foaming. may be formed, and for example, the pre-foam may be treated at a temperature of 100 to 160° C. for, for example, 1 to 10 minutes to form foam. Furthermore, additional pressure may be applied.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are only examples to help the understanding of the present invention, and the scope of the present invention is not limited thereto.

Example

1. Preparation of foaming composition

(1) Preparation of resin mixture for foaming

Preparation Example 1

3-(trimethoxysilyl)propyl methacrylate (hereinafter referred to as 'TMPMA') 36 g, trimethylolpropane trimethacrylate (hereinafter referred to as 'TMPTMA') 45 g, triallyl cyanurate (TAIC) 10 g and 9 g of urushiol were mixed at room temperature to prepare a mixed solution JN20-A.

Preparation 2

A mixed solution JN20-B was prepared in the same manner as in Preparation Example 1, except that 22.5 g of TMPMA, 45 g of TMPTMA, 25 g of TAIC and 7.5 g of urushiol were used.

Preparation 3

A mixed solution JN20-C was prepared in the same manner as in Preparation Example 1, except that 9 g of TMPMA, 45 g of TMPTMA, 40 g of TAIC and 6 g of urushiol were used.

(2) Preparation of composition for foaming

800 g of polyethylene resin, 200 g of sodium bicarbonate as a foaming agent, and 10 g of the mixture of Preparation Examples 1 to 3 were respectively mixed to prepare a foaming composition, and these were each mixed with the foaming composition of Examples 1 to 3 (each PE (JN20- A), PE (JN20-B), PE (JN20-C)). At this time, the polyethylene resin was melted and mixed at a temperature of 100 to 110 °C.

Meanwhile, as a control, a foaming composition in which only 800 g of polyethylene resin and 200 g of sodium bicarbonate as a foaming agent were mixed was prepared, and this was referred to as Comparative Example 1 (PE (JN20)).

The composition for foaming was mixed in a supermixer at a temperature of 100 to 110 ° C using a blender (Brabender, Lab-station), followed by continuous extrusion using a twin extruder, and cooled using water at a temperature of 15 to 20 ° C. After cutting, extruding into cylindrical master batch pellets with an average length of 5 mm, and irradiating 0 to 60 kGy of electron beam at 16 mA at 25 kGy/cycle using an electron beam accelerator (10 MeV) to crosslink the composition for foaming Masterbatch was obtained.

2. Analysis of crosslinking degree of crosslinked composition for foaming

Specimens were prepared to evaluate the degree of crosslinking of the crosslinked foaming composition, and when the specimen was prepared, the sample was compressed between the upper and lower plates at a temperature of 180 to 215 °C of the upper plate and 180 to 215 °C of the lower plate of a hot press. wait until it melts sufficiently, then slowly apply pressure to increase the pressure until it reaches 25-30 MPa, wait for 5 to 20 minutes, take it out, and cool it at room temperature to obtain the flexural strength, tensile strength, and impact strength of a 3 mm thick sheet. A physical property measurement specimen was obtained.

The crosslinking rate of the specimen was measured 5 times through the Soxhlet extraction method to obtain an average value. More specifically, after measuring the weight of each sample, it was loaded in xylene and heated at 140 ° C. for 8 hours to remove unreacted material, dried for 12 hours using a vacuum oven, and then dried naturally for 4 hours. The weight of the sample was measured and the crosslinking rate was measured using each weight.

At this time, the crosslinking rate was calculated using the following formula (1).

Crosslinking rate (%) = (weight after reaction / weight before reaction) X 100 … Formula (1)

As a result, as can be seen in FIG. 1(b), the crosslinking rate of polyethylene is formed at less than 5% up to 40 kGy as the electron beam irradiation dose increases, but it rapidly increases at 40 to 60 kGy. , it was confirmed to be a maximum of 24.2% at an irradiation dose of 60 kGy.

On the other hand, as can be seen in Fig. 1 (a), when the electron beam was not irradiated, it was found that there was no influence on the degree of crosslinking in the case of using the foaming compositions of Comparative Examples and Examples.

However, it was confirmed that the degree of crosslinking increased by up to 53.4% when the dose of electron beam irradiation (Dose) was increased to 60 kGy. Also, as the dose of electron beam irradiation increased, the mixture of JN20-C, which is the composition of Preparation Example 3, which had a high TAIC content, was used. It was confirmed that the crosslinking degree increase rate was remarkably improved in the case of including. Therefore, it can be confirmed that the degree of crosslinking can be adjusted according to the content control of the composition for foaming.

3. Preparation of foam

Obtained in 1 above per 100 parts by weight of the mixture in a propylene mixture in which polypropylene homopolymer (Homo-PP) and polypropylene block copolymer (Block PP) are mixed in a weight ratio of 75:25 during the extrusion process in a blowing die After adding the composition for cross-linked foaming having the composition of Examples 1 to 3 and Comparative Example 1 in a ratio of 3 parts by weight, uniformly mixing to prepare a pre-foamed composition, and the pre-foamed composition at a temperature of 180 to 230°C for 2 minutes And by foaming for 5 minutes, a polypropylene foam having a thickness of 3 mm was prepared in the form of a foam board (form sheet) by a blow molding method using processing.

4. Evaluation of foam properties

Using the composition for foaming of Comparative Example 1 (PE (JN20)) and the composition for foaming crosslinked obtained by irradiating an electron beam of 60 kGy to each extrudate using the composition for foaming of Examples 1 to 3, respectively, using the above 3 A foam board was prepared by the process of ., and the physical properties were analyzed based on the KS M ISO 178: 2012 standard using this as an analysis specimen.

The analysis results shown in the drawings are presented in a way of expressing the composition for foaming for convenience of reference.

(1) Flexure stress analysis

The flexural strength of the foam specimen containing the composition for crosslinked foaming of Comparative Example 1 (PE (JN20)) was measured to be 25.21 ± 0.82 MPa, but Examples 1 to 3 (PE (JN20-A), PE (JN20-B) , PE (JN20-C)), it was confirmed that the flexural strength of the foam specimen containing the composition for crosslinked foaming was improved by about 31.88±0.54 MPa, up to about 7 MPa. The results are shown in Fig. 2(a).

(2) Flexure strain analysis

In the case of flexure strain, the flexural tensile elongation of the foam specimen containing the composition for crosslinked foaming of Comparative Example 1 (PE (JN20)) was measured to be 20.34±0.24%, and Examples 1 and 2 (PE ( The flexural tensile elongation of the foam specimen containing the composition for cross-linked foaming of JN20-A) and PE (JN20-B)) was about 19.72±1.46% and less than 20±0.63%, but there was little change in Example 3 (PE (JN20-C))), the flexural tensile elongation of the foam specimen containing the composition for crosslinking foaming is about 15.98±0.37%, which is reduced by up to 4%. As the TAIC component in the foaming composition increases, the crosslinking rate increases. It was found that the tensile elongation was decreased due to this, and this decrease in tensile elongation (elongation) is due to the formation of a crosslinked structure in the foam by electron beam irradiation. The results are shown in Fig. 2(b).

(3) Young's modulus analysis

The Young's modulus, which is an elastic modulus for measuring the stiffness of a material, is also compared to the foam specimen containing the crosslinked foaming composition of Comparative Example 1 (PE (JN20)) in Examples 1 to 3 (PE (JN20-A), PE (JN20-B), PE (JN20-C)) in the foam specimen containing the composition for crosslinked foaming, it was confirmed that the maximum improvement of about 200 MPa from about 908.2 ± 11.8 MPa to 1111.4 ± 16.5 MPa. The results are shown in Fig. 2(c).

5. Morphological Analysis of Foam

Crosslinking of a foam specimen containing the composition for crosslinking foam of Comparative Example 1 (PE (JN20)) and Examples 1 to 3 (PE (JN20-A), PE (JN20-B), PE (JN20-C)) Foam specimens containing the foaming composition were analyzed with an SEM instrument.

As a result, as shown in FIG. 3, in the case of the foam specimen including the crosslinked foaming composition of Comparative Example 1 (PE (JN20)), the foamed cells were not formed uniformly, and some cells collapsed, so that the cells and the cells were connected open. It was found that the melt strength was lowered due to the formation of an open cell, and it can be expected that a foam of this type would have a high heat loss when used for insulation purposes.

On the other hand, in the case of a foam specimen containing the composition for cross-linked foaming of Examples 1 to 3 (PE (JN20-A), PE (JN20-B), PE (JN20-C)), a single cell with stable foam cell formation (single cell) was formed and it was confirmed that an excellent foam was formed, and it can be expected that the strength of the foam is further improved due to the shape of such a cell.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and variations are possible within the scope without departing from the technical spirit of the present invention described in the claims. It will be apparent to those of ordinary skill in the art.

Claims (13)

50 to 90% by weight of a thermoplastic resin, 5 to 40% by weight of a foaming agent, and 0.5 to 10% by weight of a resin mixture for foaming,
The foaming resin mixture contains 5 to 40% by weight of an alkoxysilyl-based acrylate compound, 20 to 60% by weight of a trifunctional acrylic monomer, 1 to 15% by weight of urushiol, and 1 to 50% by weight of a cyanurate-based compound. A composition for foaming comprising.
According to claim 1, wherein the thermoplastic resin is polyethylene resin, polypropylene resin, polyvinyl chloride resin, polystyrene resin, methacrylic resin, polycaprolactone resin, polylactide resin, polyvinyl alcohol resin and polyvinylene chloride resin At least one selected from the group consisting of, foaming composition.
The composition for foaming according to claim 1, wherein the foaming agent is at least one selected from the group consisting of sodium bicarbonate, ammonium carbonate and amyl acetate.
According to claim 1, wherein the alkoxysilyl-based acrylate compound is a monomer 3-(trimethoxysilyl)propyl methacrylate (TMPMA), 3-(trimethoxysilyl) propyl acrylate, 3-[diethoxy ( Methyl) silyl] propyl methacrylate, 3-[dimethoxy (methyl) silyl] propyl acrylate, [dimethoxy (methyl) silyl] methyl methacrylate, 3- [tris (trimethylsilyloxy) silyl] propyl methacryl rate, 3-[dimethoxy(methyl)silyl]propylmethacrylate, 3-(methoxydimethylsilyl)propylacrylate, 3-(triethoxysilyl)propylmethacrylate and (triethoxysilyl)methylmethacrylate At least one selected from the group consisting of acrylates, the composition for foaming.
According to claim 1, wherein the trifunctional (trifunctional) acrylic monomer is trimethylolpropane trimethacrylate (TMPTMA), glycerol trimethacrylate (GTMA), 1,6-hexanediol dimethacrylate, 4,4 '-Isopropylidenediphenol dimethacrylate, neopentylglycol dimethacrylate, neopentylglycol diacrylate, nonamethyleneglycol dimethacrylate, pentaerythritol tetraacrylate and tris(2-acryloyl) Oxyethyl) at least one selected from the group consisting of isocyanurate, the composition for foaming.
The method according to claim 1, wherein the cyanurate-based compound is triallyl isocyanurate (TAIC), trimethylolpropane triacrylate (TMPTA), hexanediol diacrylate (HDDA) , triaryl cyanurate (triallyl cynurate, TAC) and tripropylene glycol diacrylate (tripropylene glycol diacry late, TPGDA) at least one selected from the group consisting of, the foaming composition.
Preparing the composition for foaming of any one of claims 1 to 6;
obtaining a molded article by molding the composition for foaming; and
Irradiating an electron beam to the molding
A method for producing a composition for cross-linking foaming comprising a.
The method of claim 7, wherein the electron beam is irradiated with a total dose of 10 to 200 kGy.
The method of claim 7, wherein the step of obtaining the molded product is performed by extrusion molding at a temperature of 180 to 230°C.
The composition for crosslinking foaming prepared according to claim 7.
A foam comprising the composition for crosslinking foam of claim 10 in an amount of 1 to 10 parts by weight per 100 parts by weight of a thermoplastic olefin (TPO)-based base resin.
12. The method of claim 11, wherein the thermoplastic olefin (Thermoplastic Olefin, TPO)-based base resin is at least one selected from the group consisting of polypropylene homopolymer, polypropylene random copolymer, polypropylene block copolymer, and alpha olefin-based elastomer, foam.
The foam according to claim 11, wherein the thermoplastic olefin-based base resin is a mixed resin in which a polypropylene homopolymer and a polypropylene block copolymer are mixed in a weight ratio of 2 to 4: 1.

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