JP6436881B2 - Modeling material - Google Patents

Description

  The present invention relates to a modeling material.

  Conventionally, a modeling material capable of manufacturing a modeled object by performing a heat treatment or a curing process is known.

For example, there is disclosed a modeling material made of a viscoelastic resin such as polyethylene and having a viscoelastic resin temperature in the range of 80 to 40 ° C. when the storage elastic modulus G ′ is 80,000 Pa (for example, Patent Document 1). See
Moreover, a clay composition for modeling formed by mixing a pile resin (natural resin) and bead wax (natural wax) is disclosed (for example, see Patent Document 2).
Further, there has been disclosed an erased clay obtained by heating and kneading a composition mainly composed of a vinyl chloride paste resin and two or more kinds of plasticizers having different gelation rates (see, for example, Patent Document 3).

JP 2011-231168 A JP 2006-291154 A JP-A-1-294758

The modeling material disclosed in Patent Document 1 has a problem that it is difficult to model with bare hands at room temperature, and heating is required for modeling, which takes time.
Moreover, although the material currently disclosed by patent document 2 and patent document 3 is easy to shape | mold at normal temperature, there exists a problem that shape retention property is low when it is not made to harden | cure. Furthermore, the materials disclosed in Patent Literature 2 and Patent Literature 3 are easy to form, but are too soft, and sheet molding is difficult.

  An object of the present invention is to provide a modeling material that can be modeled with bare hands at room temperature and has high shape-retaining properties without being cured.

Specific means for solving the above problems are as follows.
<1> Compression permanent strain measured according to JIS K 6262 (2013) "Vulcanized rubber and thermoplastic rubber-Determination of compression set at normal temperature, high temperature and low temperature" is in the range of 75% to 100%. Yes, durometer hardness measured according to JIS K 6253-3 (2012) "Vulcanized rubber and thermoplastic rubber-Determination of hardness-Part 3: Durometer hardness" is 40 to 90 with a type A durometer The tensile strength measured according to JIS K 6251 (2010) “vulcanized rubber and thermoplastic rubber—how to obtain tensile properties—” is in the range of 1.5 MPa to 4.0 MPa, A modeling material containing a bulk rubber, a liquid softening agent and fine powdered porous silica.
<2><1> in which 10 parts by mass or more and 200 parts by mass or less of the liquid softening agent and 100 parts by mass or more and 200 parts by mass or less of the fine powdered porous silica are blended with respect to 100 parts by mass of the bulk rubber. The modeling material described.
<3> The modeling material according to <1> or <2>, wherein the massive rubber is a raw rubber or a thermoplastic elastomer.
<4> the a liquid softener mineral oil-based softening agent, the kinematic viscosity of the mineral oil-based softening agent is within the range of 10mm ² / s~500mm ² / s at 40 ° C. <1> ~ <3> The modeling material as described in any one of these.
<5> The modeling material according to any one of <1> to <4>, wherein an average pore diameter of the finely powdered porous silica is in a range of 3 nm to 100 nm.
<6> The modeling material according to any one of <1> to <5>, which is formed into a sheet having a thickness of 0.1 mm to 5 mm.

  The present invention can provide a modeling material that can be modeled with bare hands at room temperature and has high shape retention without being cured.

2 is a photograph showing a sheet formed from a modeling material manufactured in Example 1. FIG. It is a photograph which shows the state which deform | transformed the sheet | seat shape | molded from the modeling material manufactured in Example 1 with bare hands. It is a photograph which shows the paper crane produced using the sheet | seat shape | molded from the modeling material manufactured in Example 1. FIG. It is a graph which shows the relationship between the compounding quantity (mass part) of gel method silica, and compression set. It is a graph which shows the relationship between the compounding quantity (mass part) of gel method silica, and tensile strength. It is a graph which shows the relationship between tensile strength and compression set. It is a graph which shows the relationship between the average pore diameter of gel method silica, and compression set.

  In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value. In addition, in the present specification, the blending amount of each component in the modeling material is the total amount of a plurality of types of substances corresponding to the component, unless otherwise specified, when a plurality of types of substances corresponding to the respective components are used in combination. means.

  The molding material according to one embodiment of the present invention has a compression set measured according to JIS K 6262 (2013) “Vulcanized rubber and thermoplastic rubber-Determination of compression set at normal temperature, high temperature and low temperature”. Durometer hardness in the range of 75% to 100%, measured according to JIS K 6253-3 (2012) "Vulcanized rubber and thermoplastic rubber-Determination of hardness-Part 3: Durometer hardness" However, the tensile strength measured according to JIS K 6251 (2010) “Vulcanized rubber and thermoplastic rubber—How to obtain tensile properties” is 1.5 MPa to It is in the range of 4.0 MPa, and includes a lump rubber, a liquid softening agent and fine powdery porous silica.

  The modeling material which concerns on this embodiment has a high shape retainability, without carrying out a hardening process because a compression set exists in the range of 75%-100%. Furthermore, the modeling material which concerns on this embodiment has durometer hardness in the range of 40-90 with a type A durometer, and tensile strength exists in the range of 1.5 MPa-4.0 MPa, It becomes a soft material that can be shaped with bare hands at room temperature, and further, since it has the same hardness as a general rubber material, sheet molding is also easy.

  In this embodiment, the compression set measured according to JIS K 6262 (2013) may be in the range of 75% to 100% immediately after the unloading of the compressive force, but immediately after and after the unloading of the compressive force. In the range of 75% to 100%.

  In addition, the modeling material according to the present embodiment has a higher shape-retaining property without being subjected to a curing process, so that the amount of change in compression set (compression permanent) immediately after unloading compression force to 14 days after unloading compression force. (Maximum strain value−minimum compression set) is preferably 2.0% or less, more preferably 1.5% or less, and even more preferably 1.0% or less.

  In addition, the modeling material according to the present embodiment preferably has a compression set within a range of 78% to 100%, and 80% to 100% because it has higher shape retention without being subjected to a curing treatment. More preferably, it is in the range of%. Moreover, it is preferable that the modeling material which concerns on this embodiment has the durometer hardness in the range of 60-90 from the point which makes modeling by bare hands at normal temperature easier, and exists in the range of 65-90. More preferably, the tensile strength is preferably in the range of 2.0 MPa to 4.0 MPa, and more preferably in the range of 2.5 MPa to 4.0 MPa.

  The modeling material which concerns on this embodiment can be modeled with bare hands at normal temperature, and is used suitably for manufacture of various molded articles. Moreover, since the modeling material which concerns on this embodiment has high shape retainability, without performing a hardening process, it is also easy to model in combination with the material which deform | transforms easily by heating or cooling. Furthermore, this modeling material is easily deformed with bare hands at room temperature and has high shape retention without being cured, so it is useful for medical devices attached to the human body, for example, soft casts. Used.

  The modeling material according to the present embodiment is not particularly limited as long as the compression set, the durometer hardness, and the tensile strength satisfy the above-described numerical ranges, but the bulk rubber, the liquid softening agent, and the fine powder porous material Silica is preferably contained, and it is more preferably composed of bulk rubber, a liquid softening agent and fine powdered porous silica.

(Lumped rubber)
The modeling material according to the present embodiment includes massive rubber. Although it does not specifically limit as a block rubber, It is preferable that it is rubber with low polarity or rubber | gum without polarity, and it is more preferable that it is raw material rubber or a thermoplastic elastomer.

  More specifically, as the bulk rubber, styrene butadiene rubber, butadiene rubber, acrylonitrile butadiene rubber, chloroprene rubber, ethylene propylene diene rubber, ethylene propylene rubber, isobutylene isoprene rubber, urethane rubber, acrylic rubber, silicone rubber, fluorine Polymers made from rubber, ethylene vinyl acetate copolymer, vinyl acetate, modified vinyl acetate, etc., vinyl acetate-acrylic copolymer, styrene-acrylic copolymer, vinyl acetate-acrylic ester copolymer, acrylic-silicon Copolymer, Acrylic-urethane copolymer, Styrenic thermoplastic elastomer, Olefin thermoplastic elastomer, Vinyl chloride thermoplastic elastomer, Urethane thermoplastic elastomer, Amide thermoplastic elastomer, S These include thermoplastic thermoplastic elastomers, fluoro thermoplastic elastomers, acrylic thermoplastic elastomers, etc. Among them, ethylene propylene diene rubber having an ENB (ethylidene norbornene) content of 4% to 6%, styrene content of 20% to 30 % Styrene butadiene rubber is preferred.

(Liquid softener)
The modeling material which concerns on this embodiment contains a liquid softening agent. Examples of the liquid softener include oils and plasticizers. Among them, oils and plasticizers having low polarity are preferable.

Examples of oils that are liquid softeners include mineral oil softeners and vegetable oil softeners. Examples of the mineral oil softener include naphthenic, paraffinic and aromatic oils. Among them, the specific gravity is 0.86-0. A paraffinic oil having a pour point of -15 ° C to -18 ° C is preferred. Paraffinic oil also includes high purity oil called liquid paraffin.
Examples of the vegetable oil-based softener include oils such as fatty acids, fatty oils, and sub (factis).

If the liquid softener is a mineral oil-based softening agent, is preferably in the range of 10mm ² / s~500mm ² / s at a kinematic viscosity of mineral oil-based softener 40 ^℃, 60mm ² / s~280mm 2 More preferably, it is in the range of / s. The kinematic viscosity of the mineral oil softener is a value measured according to JIS K 2283 (2000).

  Examples of the plasticizer that is a liquid softener include dibutyl phthalate, dioctyl phthalate, di (2-ethylhexyl) phthalate, dioctyl phthalate, dibutyl glycol adipate, dioctyl sebacate, dibutyl carbitol adipate, dioctyl sebacate, dibutyl sebacate, Examples include tricresyl phosphate, cresyl phenyl phosphate, and adipic acid polyester.

  The blending amount of the liquid softening agent is not particularly limited as long as the compression set, durometer hardness, and tensile strength of the modeling material according to the present embodiment satisfy the above numerical ranges, but with respect to 100 parts by mass of the bulk rubber. It is preferable that it exists in the range of 10 mass parts or more and 200 mass parts or less. When the blending amount of the liquid softening agent is 10 parts by mass or more, it becomes easy to blend fine powdered porous silica, and when it is 200 parts by mass or less, stickiness of the modeling material can be suppressed, and handling is possible. It becomes easy.

  Further, the blending amount of the liquid softening agent is easier to blend with the fine powdered porous silica, and more easily suppresses stickiness of the molding material, thereby facilitating handling. More preferably, it is in the range of 120 to 160 parts by mass.

(Fine powdered porous silica)
The modeling material which concerns on this embodiment contains fine powdery porous silica. Examples of the fine powdery porous silica include precipitation method silica (precipitation method silica), gel method silica, and the like, and precipitation method silica and gel method silica may be used in combination.

  The fine powdery porous silica preferably has an average pore diameter of 3 nm (30 Å) or more and 100 nm (1000 Å) or less, and more preferably in the range of 10 nm (100 Å) or more and 30 nm (300 Å) or less. Thereby, the shape retention property of modeling material can be made favorable. In particular, when the average pore diameter of finely powdered porous silica is 10 nm (100 Å) or more, compression set, which is an index of shape retention, tends to increase significantly. This is because, as the average pore diameter increases, the solid rubber or the continuous phase (matrix) mainly composed of the bulk rubber is easily taken into the pores of the fine powdery porous silica. Guessed. In addition, the average pore diameter of the fine powdery porous silica is a value measured by a nitrogen adsorption method.

  Moreover, it is preferable that the compounding quantity of fine powdery porous silica is more than 100 mass parts and 200 mass parts or less with respect to 100 mass parts of lump rubber. By being more than 100 parts by mass, the strength and shape retention of the modeling material can be improved, and by being 200 parts by mass or less, the modeling material can be suitably prevented from becoming brittle.

  In addition, the blending amount of the fine powdery porous silica is 120 with respect to 100 parts by mass of the bulk rubber from the viewpoint that the strength and shape retention of the modeling material are improved and the modeling material is more preferably suppressed from becoming brittle. More preferably, it is at least 180 parts by mass and even more preferably at least 140 parts by mass.

  Moreover, the modeling material which concerns on this embodiment may use precipitation method silica and gel method silica together. In this case, the compounding amount of the precipitation method silica is preferably more than 80 parts by mass and more preferably 100 parts by mass or more with respect to 100 parts by mass of the bulk rubber. Furthermore, the compounding amount of the gel method silica is preferably 20 parts by mass or more, more preferably 30 parts by mass or more, and further preferably 40 parts by mass or more with respect to 100 parts by mass of the bulk rubber. When the compounding amount of the gel method silica is 20 parts by mass or more, the strength and shape retention of the modeling material can be further improved. In addition, although the upper limit of the compounding quantity of gel method silica is not specifically limited, It is preferable that it is 80 mass parts with respect to 100 mass parts of block rubber.

  Furthermore, when the modeling material which concerns on this embodiment uses precipitation method silica and gel method silica together, the sum total of the compounding quantity of precipitation method silica and gel method silica is more than 100 mass parts 200 with respect to 100 mass parts of block rubber. It is preferably no greater than part by mass, more preferably no less than 120 parts by mass and no greater than 180 parts by mass, and even more preferably no less than 140 parts by mass and no greater than 180 parts by mass.

The secondary particle diameter of the fine powdery porous silica is preferably 1 μm or more and 50 μm or less, and more preferably 1 μm or more and 20 μm or less. The BET specific surface area of silica is preferably 20 m ² / g or more and 1000 m ² / g or less, and more preferably 150 m ² / g or more and 750 m ² / g or less. The pore volume of the fine powdery porous silica is preferably 0.3 ml / g or more and 2.5 ml / g or less, more preferably 0.5 ml / g or more and 2.5 ml / g or less.
As a representative example of the precipitated silica, there is a trade name Nipsil VN-3 of Tosoh Silica Co., Ltd. having a secondary particle diameter of 11 μm, a BET specific surface area of 200 m ² / g and a pore volume of 1.2 ml / g. Moreover, as a representative example of the gel method silica, trade name NIPGEL AZ-200 of Tosoh Silica Co., Ltd. having a secondary particle diameter of 1.9 μm, a BET specific surface area of 300 m ² / g, and a pore volume of 2.0 ml / g can be mentioned. It is done.

  Examples of commercially available precipitation silica include Nipsil VN-3 (Tosoh Silica Co., Ltd.), Carplex # 80 (DSL Japan Co., Ltd.), Mizukasil P-50 (Mizusawa Chemical Co., Ltd.), and the like. However, Nipsil VN-3 (Tosoh Silica Corporation) is preferable.

The secondary particle diameter of the fine powdery porous silica can be measured by a Coulter counter method. The BET specific surface area and pore volume of fine powdered porous silica can be measured by a nitrogen adsorption method.

  The modeling material according to the present embodiment may contain other components other than the lump rubber, the liquid softening agent, and the fine powdery porous silica within the range where the effects of the present invention are exhibited. For example, the ultraviolet absorber, the aging Inhibitors, tackifiers, anticorrosives, antibacterial agents, colorants such as pigments and dyes, light shielding agents such as titanium oxide, antistatic agents, flame retardants, fillers such as carbon black, calcium carbonate, magnesium carbonate Etc.

  The modeling material which concerns on this embodiment can be shape | molded in a sheet form, for example, may be shape | molded by the sheet | seat of thickness 0.1 mm or more and 5 mm or less. Since the modeling material which concerns on this embodiment has hardness equivalent to a general rubber material, it is a material with which sheet | seat shaping | molding is easy.

  The present invention will be described more specifically with reference to the following examples. However, the present invention is not limited to these examples.

Example 1
First, ethylene propylene diene rubber (trade name: JSR EP-57C) 100 g, paraffinic oil (trade name: Diana Process Oil PW-90, kinematic viscosity at 40 ° C .: 90 mm ² / s), precipitation method silica (trade name) : Nipsil VN-3) 100 g, gel method silica (trade name: NIPGEL AZ-200, average pore size: 22 nm) 64 g from a modeling material obtained by kneading using a mixing roll and Banbury mixer Produced. Next, using the sheet, a large test piece was prepared with a hot press as specified in JIS K 6262 (2013), and then shape retention was evaluated with a compression set tester (evaluation index: compression set). ). The compression rate during the test was 25% with respect to the thickness of the test piece, and the compressive force was released immediately after the test piece was compressed. And when compression set was measured immediately after unloading, after 30 minutes, 60 minutes, 120 minutes, 6 days, and 14 days, 87.7%, 87.4%, 86.7%, It was almost constant at 86.7%, 86.6%, and 86.7%. Moreover, as a result of performing the durometer hardness test according to JISK6253 (2012) using the said modeling material, hardness was 73 by the type A durometer. Furthermore, the tensile strength was 2.74 MPa as a result of conducting a tensile test using the modeling material according to JIS K 6251 (2010).

  A 150 mm square sheet having a thickness of 1 mm produced using the modeling material is shown in FIGS. Further, FIG. 3 shows a paper crane produced using the sheet. As shown in FIG. 3, the sheet can be formed like origami at room temperature. In addition, since there is no macroscopic change even after 5 months from the production, the modeling material of this example can be modeled with bare hands at room temperature, and has high shape retention even without being cured. It was shown that.

(Comparative Example 1)
A modeling material and a sheet having a thickness of 4 mm were produced in the same manner as in Example 1 except that the gel method silica (trade name: NIPGEL AZ-200) was not blended.

(Example 2)
A modeling material and a sheet having a thickness of 4 mm were produced in the same manner as in Example 1 except that the amount of gel method silica (trade name: NIPGEL AZ-200) was changed from 64 g to 21 g.

Example 3
A modeling material and a sheet having a thickness of 4 mm were prepared in the same manner as in Example 1 except that the amount of gel method silica (trade name: NIPGEL AZ-200) was changed from 64 g to 43 g.

  About the sheet | seat of the comparative example 1, Example 2, 3, it carried out similarly to Example 1, and measured the compression set at the time of 30-minute progress after unloading of compressive force. As a result, the compression set of each sheet was 55.6%, 78.3%, and 83.0%, respectively. Moreover, as a result of performing a durometer hardness test on Comparative Example 1, Examples 2 and 3 in the same manner as in Example 1, the hardness was 37, 51, and 64, respectively, as a type A durometer. Furthermore, as a result of measuring the tensile strength of Comparative Example 1 and Examples 2 and 3 in the same manner as in Example 1, they were 1.10 MPa, 2.32 MPa, and 2.68 MPa, respectively.

  Based on the results of Examples 1 to 3 and Comparative Example 1, FIG. 4 shows the relationship between the amount (parts by mass) of the gel method silica and the compression set. FIG. 4 shows that the compression set is improved as the blending amount of the gel method silica is increased.

  Based on the results of Examples 1 to 3 and Comparative Example 1, FIG. 5 shows the relationship between the blending amount (parts by mass) of the gel method silica and the tensile strength. From FIG. 5, it was shown that the tensile strength improves as the blending amount of the gel method silica increases.

  Furthermore, based on the results of Examples 1 to 3 and Comparative Example 1 and FIGS. 4 and 5, FIG. 6 shows the relationship between tensile strength and compression set. From FIG. 6, it was shown that the tensile strength and the compression set are in a proportional relationship.

(Examples 4 to 6)
The types of gel method silica are changed from NIPGEL AZ-200 (average pore size: 22 nm) to NIPGEL AY-200 (average pore size: 19 nm), NIPGEL BY-200 (average pore size: 10 nm), NIPGEL CX-200 (average pore size) : 4 nm) A molding material and a sheet having a thickness of 4 mm were produced in the same manner as in Example 1 except that the thickness was changed to 4 nm.

  About the sheet | seat of Examples 4-6, it carried out similarly to Example 1, and measured the compression set at the time of 30-minute progress after unloading | compressing force. The results of Example 1 and Examples 4 to 6 are shown in Table 1.

  Further, based on the results of Example 1 and Examples 4 to 6, FIG. 7 shows the relationship between the average pore diameter of gel method silica and compression set. From FIG. 7, when the average pore diameter was 10 nm or more, there was a tendency for the compression set to increase significantly.

(Example 7)
First, ethylene propylene diene rubber (trade name: JSR EP-57C) 100 g, paraffinic oil (trade name: Diana Process Oil PW-90, kinematic viscosity at 40 ° C .: 90 mm ² / s), precipitation method silica (trade name) : Nipsil VN-3) A sheet having a thickness of 4 mm was prepared from a molding material obtained by kneading 164 g using a mixing roll and a Banbury mixer. Next, using the sheet, a large-sized test piece was prepared as specified in JIS K 6262 (2013) with a hot press machine, and then shape retention was evaluated with a compression set tester (evaluation index: compression permanent) Strain). The compressibility was 25% with respect to the thickness of the test piece, and the compressive force was removed immediately after the test piece was compressed. And it was 84.1% when the compression set after 30 minutes passed after compressive force unloading was measured.

  The average pore diameter of the precipitated silica (Nipsil VN-3) used in Example 7 is 24 nm, which is almost the same value as the average pore diameter of 22 nm of the gel silica (NIPGEL AZ-200) used in Example 1. is there. For this reason, it is presumed that the compression set also has an equivalent value.

(Evaluation of shape retention by non-contact 3D measuring machine)
The modeling material of Example 1 was molded into a sheet having a thickness of 2 mm, and a test piece having a width of 25 mm and a length of 100 mm was cut out from the sheet. Then, the test piece was folded in half at the center in the length direction and then returned to 90 degrees, and shape data was obtained using a non-contact type three-dimensional measuring machine. The angle of the test piece was analyzed from the shape data, and the angle retention after 30 minutes, 60 minutes, 120 minutes, 240 minutes, and 15 days was measured. As a result, the angle retention rate at each elapsed time was almost constant at 99.7%, 99.9%, 100%, 100%, and 98.8%.

(Mold resistance test)
The modeling material of Example 1 was formed into a 1 mm thick sheet, and a 30 mm square test piece was cut out from the sheet. And the fungus resistance test of JIS Z 2911 (2010) was done using the test piece. As a result, it was shown that this test piece was the best (result display: 0) in a three-step evaluation and had high mold resistance.

(Example 8)
First, 100 g of styrene-butadiene copolymer rubber (trade name: JSR SBR1502), 143 g of naphthenic oil (trade name: Diana Process Oil NR-68, kinematic viscosity at 40 ° C .: 68 mm ² / s), precipitated silica (trade name) : Nipsil VN-3) 100 g and gel method silica (trade name: NIPGEL AZ-200) 64 g were prepared from a modeling material obtained by kneading using a mixing roll and a Banbury mixer to prepare a sheet having a thickness of 4 mm. Next, using the sheet, a large-sized test piece was prepared as specified in JIS K 6262 (2013) with a hot press machine, and then shape retention was evaluated with a compression set tester (evaluation index: compression permanent) Strain). The compressibility was 25% with respect to the thickness of the test piece, and the compressive force was removed immediately after the test piece was compressed. And the compression set when 30 minutes passed after compressive-force unloading was 82.2%. Moreover, as a result of performing the durometer hardness test of JIS K 6253 (2012) using the said modeling material, hardness was 66 by the type A durometer. Furthermore, as a result of performing a tensile test of JIS K 6251 (2010) using the modeling material, the tensile strength was 2.23 MPa.

(Comparative Example 2)
A sheet having a thickness of 4 mm was produced in the same manner as in Example 1 except that the gel method silica used in Example 1 was changed to kaolin clay which was not fine powdery porous silica. In the same manner as in Example 1 using the sheet, compression set was measured after 30 minutes from unloading of the compressive force. As a result, the compression set was 63.7%, which was inferior to the sheet using precipitated silica or gel silica. Moreover, using the same sheet, an attempt was made to produce a folded paper crane as in Example 1. However, the paper crane was not able to be produced because of high rubber elasticity and poor formability.

(Comparative Example 3)
A sheet having a thickness of 4 mm was prepared in the same manner as in Example 1 except that the gel method silica used in Example 1 was changed to bentonite which was not fine powdery porous silica. In the same manner as in Example 1 using the sheet, compression set was measured after 30 minutes from unloading of the compressive force. As a result, the compression set was 72.8%, which was inferior to the sheet using precipitated silica or gel silica. This indicates that fine powdered porous silica is suitable for increasing compression set.

The measurement results of compression set, durometer hardness and tensile strength in Examples 1 to 8 and Comparative Examples 1 to 3 are shown in Table 2 below.

  As shown in Table 2, in Examples 1 to 8, the compression set was 75% or more, the durometer hardness was 40 or more, and the tensile strength was 1.5 MPa or more. Therefore, the modeling material in Examples 1 to 8 does not deform as easily as clay at room temperature, but it can be modeled with bare hands by applying a certain load, and has high shape retention without being cured. Had. In particular, in Examples 1 and 7, the compression set is 80% or more, the durometer hardness is 65 or more, and the tensile strength is 2.5 MPa or more. The modeling material in Examples 1 and 7 is the same as in other examples. By having a strength higher than that of the modeling material, sheet molding was easier, and there was less change in shape with the passage of time when forming a modeled article, and it had higher shape retention.

  On the other hand, as shown in Table 2, in Comparative Examples 1 to 3, the compression set was less than 75%. Therefore, the modeling materials in Comparative Examples 1 to 3 have high rubber elasticity and are difficult to model, and the shape retention is insufficient.

Claims (6)

The compression set measured according to JIS K 6262 (2013) "Vulcanized rubber and thermoplastic rubber-Determination of compression set at normal temperature, high temperature and low temperature" is in the range of 75% to 100%. K 6253-3 (2012) "Vulcanized rubber and thermoplastic rubber-Determination of hardness-Part 3: Durometer hardness" Durometer hardness measured in the range of 40 to 90 with a type A durometer The tensile strength measured according to JIS K 6251 (2010) “vulcanized rubber and thermoplastic rubber—how to obtain tensile properties—” is in the range of 1.5 MPa to 4.0 MPa,
A modeling material containing a bulk rubber, a liquid softening agent and fine powdered porous silica.   The modeling according to claim 1, wherein 10 parts by mass or more and 200 parts by mass or less of the liquid softening agent and 100 parts by mass or more and 200 parts by mass or less of the fine powdered porous silica are blended with respect to 100 parts by mass of the bulk rubber. material.   The modeling material according to claim 1, wherein the massive rubber is a raw rubber or a thermoplastic elastomer. The liquid softener is a mineral oil softening agent, any one of claims 1 to 3 kinematic viscosity of the mineral oil-based softening agent is within the range of 10mm ² / s~500mm ² / s at 40 ° C. 1. The modeling material according to item 1.   The modeling material according to any one of claims 1 to 4, wherein an average pore diameter of the fine powdery porous silica is in a range of 3 nm to 100 nm.   The modeling material of any one of Claims 1-5 shape | molded by the sheet | seat of thickness 0.1mm or more and 5mm or less.