JP2020050755A - Method of altering shape of molded article, molding material used for the method - Google Patents

Abstract

To provide a method of altering a shape of a molded article capable of easily altering a shape of a resin molded article, and capable of making the molded article high strength or high rigidity after altering, and a molding material used for the method.SOLUTION: There is prepared a molding material obtained by having a polymer composition for molding having a melting point of 120°C or higher, a glass transition temperature of 30-50°C, and a crystallization temperature of 50-120°C contain an acceleration material for accelerating heating of the polymer composition. A molded article is molded using the molding material, and thereafter the polymer composition is softened to deform the molded article by heating the polymer composition with an effect of the acceleration material.SELECTED DRAWING: None

Description

  The present invention relates to a method for changing the shape of a molded article and a molding material used in the method.

  BACKGROUND ART Resin molded products are widely used in industrial articles, daily necessities and the like. Examples of the molding method include an injection molding method, an extrusion molding method, a blow molding method, a rotational molding method, a cutting molding method, and an additional manufacturing method. Regarding the molded article obtained by these molding methods, the shape after molding is basically not changed. Therefore, it is difficult to cope with a case where the molded product is not in a shape desired by the user. For example, among the above molding methods, the cutting molding method and the additional manufacturing method are suitable for small-quantity production of a resin molded product, and a 3D model is designed before molding and is applied to a molding machine to obtain a desired shape. Can be obtained. However, when a real object is picked up after molding and the user notices a point to be corrected, the correction must be started again from the correction of the 3D model, and thus there is a problem that it takes time and effort.

  If the resin is a low melting point resin such as paraffin or polycaprolactone, the shape can be changed by heating with hot water or the like after molding to make it semi-melted or melted to make it easier to soften. However, the heat resistance of the deformed resin molded product is poor, and its use is limited.

  In order to solve this problem, the present inventors have developed a resin molded product that is in an amorphous state immediately after hot melt additive manufacturing and has a glass transition temperature of 50 ° C. or less, and can be softened by heating with a single skin. (Patent Document 1). This resin molded product is a resin molded product that can be softened by a heat source generally used in a home environment such as hot water or a hair dryer. Then, the shape can be fixed by the crystallization treatment after the shape change, and heat resistance can be imparted.

International Publication No. WO2018 / 012539

  In Patent Document 1 described above, a resin molded product is molded using a material extrusion type additional manufacturing device such as a 3D printer. However, when a model having a plurality of material ejection heads is used, only a part of the resin molded product is used. It also mentions that the shaping material according to the present invention is arranged, and other parts, such as conventionally known PLA and ABS, are arranged to soften and change the shape of only specific parts. However, in the case of a large-sized, thick model, the heating time until softening becomes extremely long, and it is difficult to selectively heat and soften only specific portions.

  An object of the present invention is to provide a method of changing the shape of a molded article and a molding material used in the method, which can easily change the shape of the resin molded article, and can make the molded article have high strength or high rigidity after the change. It is in.

  In order to solve the above-mentioned problems, a method for changing the shape of a molded article according to the present invention is characterized in that a melting point is 120 ° C. or higher, a glass transition temperature is 30 to 50 ° C., and a crystallization temperature is 50 to 120 ° C. For the polymer composition for, preparing a molding material containing an accelerating material for accelerating the heating of the polymer composition, molding a molded article using this molding material, after that, by the action of the accelerating material By heating the polymer composition, the polymer composition is softened to deform a molded article.

  According to the method of changing the shape of a molded article of the present invention, it is preferable that the polymer composition be crystallized by further heating after the molded article is deformed.

  The molding material used for the method for changing the shape of a molded article of the present invention has a melting point of 120 ° C. or more, a glass transition temperature of 30 to 50 ° C., and a crystallization temperature of 50 to 120 ° C. The molding polymer composition contains an accelerating material for accelerating the heating of the polymer composition.

  In the above molding material, the promoting materials for promoting the heating of the polymer composition include (a) a material having better thermal conductivity than the polymer composition, (b) a material absorbing microwaves, c) It is preferably at least one of a material that absorbs infrared rays. Among them, the material having better thermal conductivity than the polymer composition (a) is preferably at least one of a carbon-based material and a ceramic-based material. The material that absorbs the microwave of “(b)” is preferably at least one of a carbon-based material, a metal-based material, silicon carbide, and a polyvinyl chloride-based material. The material that absorbs the infrared light of “(c)” is preferably at least one of a carbon-based material, a ceramic-based material, and an organic dye-based material.

  In the above molding material, as one form, the polymer composition is a composition containing a polyester copolymer containing terephthalic acid as an acid component and ethylene glycol and 1,4-butanediol as a diol component. Is preferred. In the above molding material, as another form, the polymer composition contains a polyester copolymer containing terephthalic acid and ε-caprolactone as an acid component, and ethylene glycol and 1,4-butanediol as a diol component. Suitably, it is a composition.

  According to the method for changing the shape of a molded article of the present invention and the molding material used in the method, the glass transition temperature of the polymer composition constituting the molding material is 30 to 50 ° C. It can be performed at a low temperature of about 50 ° C. That is, the molded article can be quickly softened and changed in shape simply by heating the molded article at a low temperature of about 30 to 50 ° C. using an accelerating material for accelerating the heating of the polymer composition. In addition, since the recrystallization temperature of the polymer composition is 50 to 120 ° C., after the shape is changed, the molded article can be quickly made to have high strength or high rigidity by further heating using an accelerating material. Moreover, the heat treatment at that time can be performed at about 100 ° C. Therefore, according to the present invention, the shape of the molded article can be easily changed at home, and the molded article can be easily made to have high strength or high rigidity at home.

It is a figure which shows the installation state of the test piece when measuring the sagging length of the test piece of an Example and a comparative example.

  In the molding material of the present invention, a specific polymer composition contains an accelerating material for accelerating the heating of the polymer composition.

  The polymer composition is a crystalline thermoplastic resin having a melting point of 120 ° C. or higher, a glass transition temperature of 30 to 50 ° C., and a crystallization temperature of 50 to 120 ° C. Here, the temperature was raised to the melting point + 50 ° C. at 20 ° C./min by DSC and held for 1 minute, and then the temperature was lowered at 20 ° C./min. Each value is specified from the temperature.

  The polymer composition is not particularly limited as long as it satisfies the above temperature conditions. For example, those mainly containing a polyester copolymer containing terephthalic acid as an acid component and ethylene glycol and 1,4-butanediol as diol components are preferably used. Alternatively, those mainly containing a polyester copolymer containing terephthalic acid and ε-caprolactone as acid components and ethylene glycol and 1,4-butanediol as diol components are also preferably used. In addition, ε-caprolactone is a cyclic ester, but for the sake of convenience, it is herein assumed that it belongs to the acid component.

  The above polyester copolymer can be produced by a known polycondensation method. That is, in general, it can be produced by charging 50 mol% of an acid component and 50 mol% of a diol component and performing dehydration condensation. As described above, it is preferable to use terephthalic acid (in addition to ε-caprolactone if necessary) as the acid component, and to use ethylene glycol and 1,4-butanediol as the diol component. Used for adjusting the transition temperature and the crystallization temperature.

  The amount of 1,4-butanediol used in combination with ethylene glycol as the diol component is preferably 30 to 70 mol% of the diol component. When the amount of 1,4-butanediol is less than 30 mol% or more than 70 mol%, the glass transition temperature of the polyester copolymer tends to be hard to lower. The amount of ε-caprolactone used in combination with terephthalic acid as the acid component is preferably 5 to 20 mol% in the acid component. When ε-caprolactone is used as a copolymer component, the glass transition temperature of the polyester copolymer can be further reduced. When ε-caprolactone exceeds 20 mol%, the polyester copolymer tends to be hardly crystallized at a predetermined temperature.

  As described above, the polymer composition has a melting point of 120 ° C or higher, and preferably 120 to 200 ° C. If the melting point is less than 120 ° C., the resin molded product cannot withstand high temperatures such as boiling water when performing crystallization treatment. On the other hand, if the melting point is 200 ° C. or higher, the material may not be melted by the heater capability of a material extrusion type 3D printer generally distributed as a low-priced product. However, this does not apply when the heater capacity is sufficient.

  The glass transition temperature of the polymer composition is 30 to 50 ° C as described above. That is, the molded article obtained by using the molding material of the present invention has not been crystallized and has many amorphous regions unless heat-treated at the crystallization temperature. Therefore, when the molded article is heated to a temperature equal to or higher than the glass transition temperature, the shape can be easily changed. Since the glass transition temperature is 30 to 50 ° C., the shape can be easily changed, for example, when the glass is immersed in bath water or held with fingers.

  When heat treatment is performed at the crystallization temperature after the shape change, crystallization proceeds and a molded product having high strength or high rigidity can be obtained. The crystallization temperature of the polymer composition is from 50 to 120C as described above. The temperature is preferably higher than the glass transition temperature by at least 20 ° C. If the crystallization temperature is too high, it is difficult to perform crystallization treatment with a heat source provided at home, such as a dryer or hot water, and it is particularly difficult for individual users to handle. If the crystallization temperature is too close to the glass transition temperature, crystallization tends to proceed when the molded article is heated to change its shape, and the time for sufficiently softening becomes short, which makes handling difficult. The crystallization temperature is a temperature at which crystallization of the polyester copolymer is most promoted. For example, if the crystallization temperature is about 100 ° C., immersion in boiling water promotes crystallization, resulting in a molded product having high strength or high rigidity.

  Specific examples of the accelerating material for accelerating the heating of the polymer composition include a material having better thermal conductivity than the polymer composition, a material absorbing microwaves, and a material absorbing infrared rays. Can be. These can be used arbitrarily in combination.

  Materials having better thermal conductivity than the polymer composition are those that are blended into the polymer composition in order to promote the heating of a specific portion of the molded article when the resin molded article is heated. It can be selected from a system or the like. The amount of addition varies depending on the shape and size of the resin molded product, the output and distance of the heat source, etc., but is preferably about 0.1 to 20% by mass.

  The material that absorbs microwaves is a compound that is added to the polymer composition in order to promote the heating of a specific portion of the molded article when the resin molded article is irradiated with microwaves. Aluminum, iron, etc.), silicon carbide, polyvinyl chloride, and the like. The addition amount varies depending on the shape and size of the resin molded product, the output of the microwave source, the distance to the microwave source, and the like, but is preferably about 0.01 to 10% by mass.

  The material that absorbs infrared rays is compounded in the polymer composition in order to promote the heating of a specific part of the molded article when the resin molded article is irradiated with infrared rays.Carbon-based, ceramic-based, organic dye-based (Such as a cyanine compound, an aminium compound, and an anthraquinone compound). The addition amount varies depending on the shape and size of the resin molded product, the output of the infrared ray source, the distance to the radiation source, and the like, but is preferably about 0.01 to 10% by mass.

  In the molding material of the present invention, in addition to the polymer composition and an accelerating material for accelerating the heating of the polymer composition, other polymers are added for adjusting the strength and the like of the resin molded article. You may. For example, polyolefin resin, acrylic resin, vinyl acetate resin, polyester resin, polyamide resin, vinyl chloride resin, vinylidene chloride resin, polytetrafluoroethylene resin, silicone resin or polyurethane resin alone Or after mixing with one another, they may be added to the molding composition. These other polymers may be added inside a specific portion of the resin molded article, or may be added in a state of covering the surface thereof.

  The molding material of the present invention may contain various additives as desired. For example, a dye or pigment may be added for coloring. In particular, in the present invention, if a thermochromic pigment that changes color at the glass transition temperature and the crystallization temperature is added, whether or not a specific portion of the resin molded article can be deformed, or whether or not the polymer composition of the specific portion has crystallized It can be determined whether or not it is preferable. Further, a filler, a plasticizer, a flame retardant, a lubricant, a weathering agent, an antioxidant, a heat resistant agent, and the like can be added.

  It is preferable to use a resin having a Tg of 50 ° C. or higher and a Tm of 120 ° C. or higher for a portion other than a specific portion to be deformed after molding in a resin molded product. In this resin, it is preferable that a small amount of an accelerating material for accelerating the heating of the polymer composition is not contained or is small so that heating of a portion other than a specific portion to be deformed after molding does not proceed more than necessary. Further, it is desirable that the resin used in a portion other than the specific portion is selected so as to obtain a sufficient interfacial adhesion with a material used in the specific portion. For example, when the polymer composition used for the specific site is a polyester-based resin, it is desirable to use a polyester-based resin, which is a resin of the same type, or a polyurethane-based resin having a high affinity for polyester except for the specific site.

  The method for obtaining the resin molded product is not particularly limited, but can be selected from an injection molding method, an extrusion molding method, a blow molding method, a rotational molding method, a cutting molding method, an additional production method, and the like. It is also possible to obtain a final resin molded product by connecting a plurality of resin parts obtained by these methods with an adhesive or a bolt. In the injection molding method and the extrusion molding method, pellets, flakes, and the like are generally used as a raw material form at the time of molding. At this time, pellets in which the polymer composition and a material for improving the thermal conductivity of the polymer composition are kneaded in advance may be used, and those prepared as separate pellets may be used by blending. You may.

  In the case of the additive manufacturing method, the material before molding needs to be in the form of a linear product or powder depending on the type of molding machine used. The filament is a continuous body having a diameter of about 1 to 3 mm, and is wound around a few tens to several hundreds of meters to form a reel and attached to a molding machine. As the filament, a monofilament yarn or a multifilament yarn obtained by aligning a plurality of monofilament yarns is used. When a multifilament yarn is used, it is preferable from the viewpoint of handling that the monofilament yarns are fused while keeping them aligned or twisted so that the monofilament yarns are not easily unraveled. Moreover, it is preferable that the filaments are obtained by braiding a monofilament yarn or a multifilament yarn with a braiding machine (braiding machine) to form a braid, and then fusing the monofilament yarns. Braids are preferable in handling because they have excellent mechanical properties such as breaking strength and bending strength. Further, the present invention is not limited to the above-mentioned ones, and any other objects having a linear shape can be used as a linear material for the additional manufacturing method.

  The monofilament yarn constituting the filament can be obtained by melting a raw material mainly composed of the polymer composition and extruding the raw material from a spinning nozzle. In particular, it is preferable to obtain a monofilament yarn by the following method. That is, it is preferable to obtain a monofilament yarn by spinning the raw material by a melt spinning method and then drawing the same to crystallize the polymer composition. It is also preferable that after spinning by a melt spinning method, a heat treatment is performed to crystallize the polymer composition to obtain a monofilament yarn. The temperature for the heat treatment is preferably in the above-mentioned temperature range where crystallization of the polymer composition proceeds. In the monofilament yarn obtained by such a method, since the polymer composition is crystallized, the filaments composed of the monofilament yarn are hardly broken and hardly deformed. Therefore, the handleability is good and preferable.

  The monofilament yarn may be a composite fiber composed of a plurality of types of resins. The composite form includes a core-sheath, sea-island, side-by-side, and the like. The polymer compositions based on the present invention may be compounded, or other resins may be compounded. The compounding ratio can also be appropriately selected, but the polymer composition based on the present invention is preferably 50% by mass or more.

  The filament attached to the molding machine is fed to the extruder by a feeder. The extruder includes an extrusion nozzle and a heating device for heating the extrusion nozzle, and the filaments are melted in the heating device and discharged from the extrusion nozzle. The extruder moves the filament based on the data, and a three-dimensional resin molded product is obtained by laminating the discharged melts. When laminating the melt, it may be heated or cooled as needed, but laminating at room temperature is sufficient. Even when heating, it is preferable that crystallization of the molded article is not promoted. Cooling may be performed arbitrarily because the molded article is less likely to be crystallized. It should be noted that, in addition to the striated object formed of the molding material of the present invention, a conventionally known striated object may be attached to the molding machine to obtain a molded article composed of a plurality of materials.

  As described above, only a specific portion of the molded product may be formed with the striated object composed of the molding material of the present invention. Further, in this case, the molding material of the present invention is used in order to improve the adhesiveness between the part formed by the filament formed by the molding material of the present invention and the part molded by the conventionally known filament. Various processes such as plasma processing may be applied to the linear object formed by the above or the molded part. According to the present invention, a filament formed from a molding material containing a material for improving the thermal conductivity of a polymer composition, and a polymer not containing a material for improving the thermal conductivity It is also possible to separately prepare a striated article composed of the composition, and then mold the striated article in a form such as coating or meshing.

  When the accelerating material for accelerating the heating of the polymer composition is a material having better thermal conductivity than the polymer composition, the heat source used for the heat treatment of the resin molded article is not particularly limited, but a drier, hot water, An electric iron, a hot plate or the like may be used. When the resin molded product is heated using these materials, if the resin molded product is heated to a temperature equal to or higher than the glass transition temperature, it softens and the shape can be changed. The polymer composition can be crystallized further continuously or by cooling once to a temperature lower than the glass transition temperature and then heating to a temperature near the crystallization temperature.

  In the case where the promoting material for promoting the heating of the polymer composition is a material that absorbs microwaves, the microwave source is not particularly limited, but a microwave oven for home use or a microwave heater for industrial use can be used. is there. The output and processing time can be adjusted according to the size and thickness of the resin molded product, and processed into a desired softness to change the shape. After the shape change, it can be cured by cooling to maintain the shape, but when heated again, it softens. If the shape is not to be lost, the polymer composition can be crystallized by heat treatment near the crystallization temperature to impart heat resistance and rigidity.

  As the heat source, in addition to the above-described microwave source, a dryer, hot water, an electric iron, a hot plate, or the like may be used in combination. When a resin molded product is heated using these materials, when heated to a temperature equal to or higher than the glass transition temperature, as in the case of using a material having good thermal conductivity, the resin is softened and its shape can be changed. The polymer composition can be crystallized further continuously or by once cooling it to below the glass transition temperature and then heating it to around the crystallization temperature.

  When the accelerating material for accelerating the heating of the polymer composition is a material that absorbs infrared rays, the infrared ray source is not particularly limited, but a household or industrial infrared heater can be used. For example, household infrared heaters include halogen heaters and carbon heaters for heating appliances. The output and processing time can be adjusted according to the size and thickness of the resin molded product, and processed into a desired softness to change the shape. After the shape change, it can be cured by cooling to maintain the shape, but when heated again, it softens. When the shape is not to be lost, heat resistance and rigidity can be imparted by crystallization by heat treatment near the crystallization temperature of the polymer composition.

  As the heat source, in addition to the above-mentioned infrared light source, a dryer, hot water, an electric iron, a hot plate, or the like may be used in combination. When the resin molded article is heated using these, similarly to the above cases, when the resin molded article is heated above the glass transition temperature, it is softened and the shape can be changed. The polymer composition can be crystallized further continuously or by once cooling it to below the glass transition temperature and then heating it to around the crystallization temperature.

  For the molded articles of the following examples and comparative examples, that is, test pieces, the following sag test was performed to evaluate the shape changeability. That is, as shown in FIG. 1, the longitudinal end of the test piece 1 was placed on the table 2 and then fixed with the double-sided tape 3. As a result, when the test piece 1 is extended 60 mm from the table 2 as shown in the drawing and heated for a predetermined time by using a heating device described later, which is suitable for each example and comparative example, the protruding edge of the test piece 1 Was measured from the initial state by the number of mm (that is, the droop length).

Example 1
43 mol% of terephthalic acid, 7 mol% of ε-caprolactone, 25 mol% of ethylene glycol, and 25 mol% of 1,4-butanediol were copolymerized by dehydration condensation to obtain a polyester copolymer. This polyester copolymer had a melting point of 160 ° C., a glass transition temperature of 30 ° C., a crystallization temperature of 75 ° C., and a specific gravity of 1.38. A material obtained by adding 0.5% by mass of carbon black to the polyester copolymer was melt-spun by an extruder-type spinning machine and stretched to obtain a black monofilament yarn having a diameter of 1.75 mm. The monofilament yarn was supplied to a 3D printer (DaVINCI PRO, manufactured by XYZ Printing Co., Ltd.) to form a plate piece of 80 mm × 10 mm × 2 mm at a nozzle temperature of 200 ° C., which was used as a test piece.

Example 2
The polyester copolymer of Example 1 was melt-spun with an extruder-type spinning machine and stretched to obtain a monofilament yarn having a color of 1.75 mm and having a generated color. This monofilament yarn was supplied to a 3D printer (DaVINCI PRO, manufactured by XYZ Printing), and a plate piece of 80 mm × 10 mm × 2 mm was formed at a nozzle temperature of 200 ° C. The entire surface of the molded plate piece was applied with a black pen (Hi-Mackey manufactured by Zebra) to obtain a test piece in which the pigment of the black pen functioned as a microwave absorbing material.

Example 3
The entire side surface of the monofilament yarn of Example 2 was applied with a black pen (Hi-Mackey manufactured by Zebra) to obtain a black monofilament yarn in which the pigment of the black pen was functioned as a microwave absorbing material. This monofilament yarn was set on a 3D printer (DaVINCI PRO, manufactured by XYZ Printing Co., Ltd.), and a plate piece of 80 mm × 10 mm × 2 mm was formed at a nozzle temperature of 200 ° C. to obtain a test piece.

Comparative Example 1
The monofilament yarn of Example 2 was set in a D printer (DaVINCI PRO manufactured by XYZ Printing), a plate piece of 80 mm × 10 mm × 2 mm was formed at a nozzle temperature of 200 ° C., and a test piece was prepared without coloring with a black pen. I got

Comparative Example 2
Polylactic acid (Nature Works Co., Ltd. 6201D (melting point 165 ° C, glass transition point 57 ° C, crystallization temperature 109 ° C) is melt-spun with an extruder-type spinning machine, stretched, and stretched to a 1.75 mm diameter uncolored monofilament. The monofilament yarn was supplied to a 3D printer (DaVINCI PRO, manufactured by XYZ Printing Co., Ltd.) to form a plate piece of 80 mm × 10 mm × 2 mm at a nozzle temperature of 200 ° C., which was used as a test piece.

  Table 1 shows the results of performing a heating test by microwave irradiation on the test pieces of Examples 1 to 3 and Comparative Examples 1 and 2. A microwave oven ("MRO-A4" manufactured by Hitachi, Ltd.) was used as an irradiation device. A test piece at 25 ° C was placed inside the microwave oven, and microwaves were irradiated at 600 W for 45 seconds. Immediately after the irradiation, the temperature of the test piece surface was measured with a non-contact thermometer.

  As can be seen from Table 1, the molded articles of Examples 1 to 3, that is, the test pieces, became soft enough to be quickly changed in shape when heated by microwaves in a microwave oven. On the other hand, since the test pieces of Comparative Examples 1 and 2 had low heating efficiency by microwaves, their softening speed was low.

  Table 2 shows the results of the sag test performed on the test pieces of Examples 1 to 3 and Comparative Examples 1 and 2. The test conditions were as follows. That is, in an environment at a room temperature of 10 ° C., a vertical carbon heater (manufactured by Konan Shoji Co., Ltd., SCY-900) was installed so that the front surface was horizontal. After placing the test piece as shown in FIG. 1, the longitudinal direction of the test piece was aligned with the direction of the coil in the carbon heater, and the test piece was placed at a height of 5 cm from the mesh portion of the vertical carbon heater. installed. The carbon heater was started at an output of "strong", and the droop length was measured after 45 seconds. Table 2 shows the results.

  As can be seen from Table 2, the molded articles of Examples 1 to 3, that is, the test pieces, were softened to the extent that the shape could be quickly changed when heated by infrared rays emitted from the carbon heater. On the other hand, since the test pieces of Comparative Examples 1 and 2 had low heating efficiency by infrared rays, the softening speed was low.

Claims (11)

  A molding material having a melting point of 120 ° C. or higher, a glass transition temperature of 30 to 50 ° C., and a crystallization temperature of 50 to 120 ° C. is provided with an accelerating material for accelerating the heating of the polymer composition. Prepare a molding material containing, molding a molded article using this molding material, then, by heating the polymer composition by the action of the accelerating material, to soften the polymer composition to form a molded article A method for changing the shape of a molded article, characterized by deforming.   The method for changing the shape of a molded article according to claim 1, wherein the polymer composition is crystallized by further heating after deforming the molded article. A molding material used for the method for changing the shape of a molded article according to claim 1 or 2,
The molding material having a melting point of 120 ° C. or more, a glass transition temperature of 30 to 50 ° C., and a crystallization temperature of 50 to 120 ° C. has an accelerating material for accelerating the heating of the polymer composition. A molding material characterized by being contained.   The molding material according to claim 3, wherein the accelerating material is a material having better thermal conductivity than the polymer composition.   The molding material according to claim 4, wherein the material having better thermal conductivity than the polymer composition is at least one of a carbon-based material and a ceramic-based material.   The molding material according to claim 3, wherein the facilitating material is a material that absorbs microwaves.   The molding material according to claim 6, wherein the microwave absorbing material is at least one of a carbon-based material, a metal-based material, silicon carbide, and a polyvinyl chloride-based material.   The molding material according to claim 3, wherein the accelerating material is a material that absorbs infrared rays.   The molding material according to claim 8, wherein the material that absorbs infrared rays is at least one of a carbon-based material, a ceramic-based material, and an organic dye-based material.   The polymer composition according to any one of claims 3 to 9, wherein the polymer composition is a composition containing a polyester copolymer containing terephthalic acid as an acid component and ethylene glycol and 1,4-butanediol as diol components. The molding material according to claim 1.   The polymer composition is a composition containing a polyester copolymer containing terephthalic acid and ε-caprolactone as an acid component and ethylene glycol and 1,4-butanediol as a diol component. 10. The molding material according to any one of 9 to 9.

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