Glass filler powder

Abstract

Provided is a glass filler powder which imparts moderate light transmission properties and improves the appearance of a molded product when compounded with a resin. A glass filler powder characterized by having a bubble in the interior, the volume content of the bubble being 0.2 to 2%.

Description

Technical Field

[0001] This invention relates to glass filler powders used to improve the mechanical strength of resins. Background Technology

[0002] Previously, in order to improve the mechanical strength of molded articles containing resin materials such as light-cured resins, the addition of filler powder to the resin material has been studied. As an application of such molded articles, their use in temporary teeth is being investigated. In order for artificial temporary teeth to achieve the same appearance (aesthetics) as human teeth, the filler powder needs to have suitable optical properties. Therefore, the use of glass filler powder with excellent light transmittance is being investigated as a filler powder (for example, see Patent Document 1).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-138180 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] Conventional glass filler powders, due to their excessively high light transmittance, tend to result in molded articles containing resin compositions with high light transmittance when combined with resin. In such cases, temporary teeth made using these resin compositions have excessively high light transmittance, leading to a mismatch between the appearance of natural teeth and aesthetic issues. It should be noted that while reducing the amount of glass filler powder in order to decrease the light transmittance of the molded article has been considered, this results in a situation where the required mechanical strength for the temporary teeth cannot be guaranteed.

[0008] In view of the above, the objective of the present invention is to provide a glass filler powder that, when combined with a resin, imparts appropriate light transmittance and improves the aesthetics of the molded article.

[0009] Technical means for solving problems

[0010] The inventors conducted in-depth research and found that the above-mentioned problems can be solved by using glass filler powder containing a specified amount of air bubbles inside.

[0011] That is, the glass filler powder of the present invention is characterized by having air bubbles inside, and the volume content of said air bubbles is 0.2% to 2%. In this way, by containing a small amount of air bubbles inside the glass filler powder, the light transmittance properties of the molded article containing the resin composition using the glass filler powder can be moderately adjusted, the aesthetics of the molded article are improved, and it is suitable for use as a temporary tooth.

[0012] The glass filler powder of the present invention is preferably substantially spherical. This reduces the contact interface with the resin, thereby suppressing excessive light scattering in the molded article containing the resin composition using the glass filler powder and imparting appropriate light transmittance to the molded article. Furthermore, it can suppress undue increase in the viscosity of the resin composition and improve formability.

[0013] The glass filler powder of the present invention preferably has a specific surface area of ​​2m². 2 / g or less. This reduces the contact interface with the resin, thus suppressing excessive light scattering in molded articles containing resin compositions using this glass filler powder, and imparting appropriate light transmittance to the molded articles. Furthermore, it prevents undue increase in the viscosity of the resin composition, improving moldability.

[0014] The glass filler powder of the present invention preferably has an average particle size of 8 μm or less. This improves its dispersibility in the resin.

[0015] The glass filler powder of the present invention preferably has a refractive index nd of 1.48 to 1.62. This makes it easy to match the refractive index with the resin, and enables the molded article containing the resin composition using the glass filler powder to impart appropriate light transmittance properties.

[0016] The glass filler powder of the present invention preferably contains, by mass percent: SiO2 40-80%, Al2O3 0-30%, B2O3 2-20%, CaO 0-25%, ZnO 0-10%, Li2O 0-10%, Na2O 0-30%, K2O 0-30%, Nb2O5 0-20%, WO3 0-20%, Nb2O5+WO3 0.1-30%, TiO2 0.1-15%, and F 0-10%.

[0017] The glass filler powder of the present invention is preferably used in combination with a resin.

[0018] The resin composition of the present invention is characterized in that it contains: the above-mentioned glass filler powder; and resin.

[0019] The molded articles of the present invention are characterized in that they comprise the above-described resin composition.

[0020] The molded articles of the present invention preferably have a light transmittance of 60-89% at a wall thickness of 0.5 mm and a wavelength of 600 nm. This makes it easy to obtain the desired aesthetics and suitable for use as temporary teeth.

[0021] The method for manufacturing filler powder of the present invention is a method for manufacturing any of the above-mentioned glass filler powders, characterized in that it includes: a step of crushing and classifying raw glass material to obtain glass powder; and a step of heating and melting the obtained glass powder to spheroidize it.

[0022] The preferred method for manufacturing the filler powder of the present invention is to use a ball mill to pulverize the raw material glass powder.

[0023] Invention Effects

[0024] According to the present invention, a glass filler powder can be provided that, when combined with a resin, imparts appropriate light transmittance and improves the aesthetics of molded articles containing a resin composition. Detailed Implementation

[0025] Hereinafter, preferred embodiments will be described with respect to the glass filler powder and other constituent components of the present invention.

[0026] (Glass filler powder)

[0027] The glass filler powder of the present invention is characterized by having air bubbles inside. The volume content of air bubbles in the glass filler powder is 0.2% to 2%, preferably 0.5% to 1.5%, and particularly preferably 0.6% to 1.2%. If the volume content of air bubbles is too low, the light transmittance of the glass filler powder becomes too high, and the light transmittance of the molded article formed from the resin composition using the glass filler powder also becomes high, tending to result in poor aesthetics. On the other hand, if the volume content of air bubbles is too high, the light transmittance of the glass filler powder becomes too low, and the light transmittance of the molded article formed from the resin composition using the glass filler powder also decreases, in which case there is also a tendency to result in poor aesthetics. It should be noted that, as described below, the volume content of air bubbles in the glass filler powder can be appropriately adjusted by the manufacturing process of the glass filler powder (especially the crushing process of the raw glass material).

[0028] The glass filler powder of the present invention is not particularly limited, but is preferably generally spherical (especially perfectly spherical). This reduces the specific surface area, thereby lowering the contact interface with the resin. As a result, excessive light scattering in the molded article containing the resin composition using the glass filler powder can be suppressed, and the molded article can be endowed with appropriate light transmittance. Furthermore, it can suppress undue increase in the viscosity of the resin composition, thereby improving formability.

[0029] The degree of sphericity can be expressed by roundness. The roundness of the glass filler powder of the present invention is preferably 2 μm or less, 1.5 μm or less, and particularly preferably 1 μm or less. Roundness is measured using the maximum particle size D. max and minimum particle size D min It can be obtained using the following formula.

[0030] Roundness (μm) = (D max -D min ) / 2

[0031] The specific surface area of ​​the glass filler powder of the present invention is preferably 2m². 2 / g or less, 1.6m 2 / g or less, 1.4m 2 / g or less, especially preferably 1.2m 2 Below a certain value (e.g.). If the specific surface area is too large, the contact interface with the resin becomes larger, making it easier for light scattering to occur inside the molded article containing the resin composition using this glass filler powder. As a result, the light transmittance of the molded article becomes excessively reduced. In addition, the viscosity of the resin composition increases inappropriately, and the formability easily decreases. There is no particular limit to the lower limit of the specific surface area; in practice, it is 0.1 m². 2 / g or more.

[0032] The average particle size (D) of the glass filler powder of the present invention 50 The average particle size is preferably 8 μm or less, and particularly preferably 7 μm or less. If the average particle size is too large, there is a tendency for poor dispersibility in the resin. There is no particular limitation on the lower limit of the average particle size, but if it is too small, the specific surface area becomes large, and light scattering is easily generated inside the molded article containing the resin composition using the glass filler powder. Therefore, the average particle size of the glass filler powder is preferably 1 μm or more, 3 μm or more, and particularly preferably 5 μm or more.

[0033] It should be noted that, in this invention, the average particle size (D) 50 () refers to the value measured by laser diffraction.

[0034] The refractive index nd of the glass filler powder of the present invention is preferably 1.48 to 1.62. This makes it easy to match the refractive index with the resin, and enables the molded article containing the resin composition using the glass filler powder to impart appropriate light transmittance properties.

[0035] The glass filler powder of the present invention preferably contains, by mass%, 40-80% SiO2, 0-30% Al2O3, 2-20% B2O3, 0-25% CaO, 0-10% ZnO, 0-10% Li2O, 0-30% Na2O, 0-30% K2O, 0-20% Nb2O5, 0-20% WO3, 0.1-30% Nb2O5+WO3, 0.1-15% TiO2, and 0-10% F. The reasons for this limited glass composition are explained below. It should be noted that, unless otherwise specified, "%" in the following descriptions of the content of each component refers to "mass %".

[0036] SiO2 is a component that forms the glass framework. It also improves chemical durability and resistance to devitrification. The preferred SiO2 content is 40–80%, 50–80%, or 50–75%, with 50–65% being particularly preferred. If there is too little SiO2, chemical durability is easily reduced, and the glass is prone to devitrification, potentially making manufacturing difficult. On the other hand, if there is too much SiO2, melt flowability is easily reduced, and it is difficult to soften during forming, potentially making manufacturing difficult.

[0037] Al2O3 is a glass-stabilizing component. It also improves chemical durability and resistance to devitrification. The preferred Al2O3 content is 0–30%, 2.5–25%, and particularly preferred is 5–20%. Excessive Al2O3 can easily reduce melt flowability. Furthermore, it is difficult to soften during molding, potentially making manufacturing difficult.

[0038] B₂O₃ is a component that forms the glass framework. It also improves chemical durability and resistance to devitrification. The preferred B₂O₃ content is 2–20%, 3–19%, and particularly preferably 5–17%. If there is too little B₂O₃, chemical durability tends to decrease. Furthermore, the glass is prone to devitrification, potentially making it difficult to manufacture. On the other hand, if there is too much B₂O₃, melt flowability tends to decrease. Additionally, it is difficult to soften during forming, potentially making it difficult to manufacture.

[0039] CaO is an alkaline earth metal and serves as an intermediate substance to stabilize the glass transition. The preferred CaO content is 0–25%, 0.5–20%, and particularly preferred is 1–15%. If too much CaO is present, the chemical durability is easily reduced, and the glass is prone to devitrification, which may make it difficult to manufacture.

[0040] ZnO is a component that reduces the viscosity of glass and inhibits devitrification. The ZnO content is preferably 0-10%, 0.1-9%, or 0.4-7%, and particularly preferably 0.6-5%. If too much ZnO is present, the chemical durability is easily reduced, and the glass is prone to devitrification, which may make it difficult to manufacture.

[0041] Li₂O is a component that reduces the viscosity of glass and inhibits devitrification. The preferred content of Li₂O is 0–10%, 0–9%, or 0–7%, and particularly preferably 0–5%. If too much Li₂O is present, the chemical durability is easily reduced, and the glass is prone to devitrification, which may make it difficult to manufacture.

[0042] Na₂O is a component that reduces the viscosity of glass and inhibits devitrification. The Na₂O content is preferably 0–30%, 0–25%, or 0–20%, and particularly preferably 0–15%. If too much Na₂O is present, the chemical durability is easily reduced, and the glass is prone to devitrification, which may make it difficult to manufacture.

[0043] K2O is a component that reduces the viscosity of glass and inhibits devitrification. The K2O content is preferably 0-30%, 0.1-25%, or 0.5-20%, and particularly preferably 1-15%. If too much K2O is present, the chemical durability will easily decrease, and the glass will be prone to devitrification, which may make it difficult to manufacture.

[0044] Nb₂O₅ is a component that can adjust the refractive index and Abbe number. The preferred Nb₂O₅ content is 0–20%, 0.1–15%, or 0.5–10%, and particularly preferably 1–5%. If there is too much Nb₂O₅, the glass is prone to devitrification.

[0045] WO3 is a component that can adjust the refractive index and Abbe number, and it also reduces the viscosity of glass. The preferred WO3 content is 0-20%, 0.1-15%, or 0.5-10%, and particularly preferred is 1-5%. If there is too much WO3, the glass is prone to devitrification.

[0046] Furthermore, the total amounts of Nb₂O₅ and WO₃ are preferably 0.1–30%, 0.1–25%, and 1–20%, respectively, and particularly preferably 2–10%. By limiting these component ranges as described above, it is easier to adjust the refractive index and Abbe number, and it becomes less difficult to color the glass. Additionally, devitrification of the glass is easily suppressed. Furthermore, it is easier to obtain glass with high chemical durability.

[0047] TiO2 is a component that can adjust the refractive index and Abbe number, and it reduces the viscosity of glass. The preferred TiO2 content is 0.1–15%, 0.1–12%, or 0.5–10%, and particularly preferably 1–5%. If there is too little TiO2, it is difficult to obtain the desired optical properties. Furthermore, chemical durability is easily reduced. On the other hand, if there is too much TiO2, it is also difficult to obtain the desired optical properties. Additionally, the glass is prone to coloration, and light transmittance is easily reduced.

[0048] Furthermore, the contents of Nb₂O₅, WO₃, and TiO₂, in total, are preferably 0.1–30%, 0.1–25%, and 1–20%, respectively, and particularly preferably 3–15%. By limiting these component ranges as described above, it is easy to adjust the refractive index and Abbe number, and it is easy to suppress glass devitrification. Furthermore, it is easy to obtain glass with high chemical durability.

[0049] Flavoring (F) is a component that forms the glass framework. It also improves transmittance, particularly in the ultraviolet region. The preferred F content is 0–10%, 0–7.5%, or 0–5%, with a particularly preferred content of 0–3%. Excessive F can easily reduce chemical durability. Furthermore, F is highly volatile; components that sublimate during manufacturing processes (especially the spheroidizing process) may adhere to the glass surface, potentially deteriorating surface properties.

[0050] It should be noted that, in addition to the above-mentioned ingredients, the following ingredients may also be included.

[0051] MgO, SrO, BaO, and ZnO are components that, like CaO, act as intermediate substances to stabilize the glass transition. The content of these components, in total, is preferably 0–50%, 0.1–50%, 0.5–40%, and particularly preferably 1–30%. Excessive content of these components can easily reduce chemical durability and cause the glass to devitrify, potentially making manufacturing difficult.

[0052] (Method for manufacturing glass filler powder)

[0053] The filler powder of the present invention can be manufactured by the following method, which includes: a step of crushing and classifying raw glass material to obtain glass powder; and a step of heating and melting the obtained glass powder to spheroidize it. The steps are described in detail below.

[0054] First, a batch of raw material powder prepared in a predetermined ratio is melted at 1400–1700°C to obtain molten glass. Next, the molten glass is shaped into a specified form (e.g., a film) to obtain raw material glass material.

[0055] Next, the obtained raw glass material is crushed and classified to obtain glass powder. A ball mill is preferably used for crushing. As shown in the embodiments described later, the volumetric content of air bubbles in the obtained glass filler powder can be adjusted by changing the crushing time of the ball mill. This is because when the raw glass material is ball-milled, the glass powder tends to agglomerate, and there is a tendency for air bubbles to form due to this agglomeration. Specifically, if the crushing time of the ball mill is short, the glass powder is less likely to agglomerate during ball milling, and air bubbles caused by this agglomeration are less likely to form. On the other hand, if the crushing time of the ball mill is long, the glass powder is more likely to agglomerate, and air bubbles caused by this agglomeration are more likely to form. From this viewpoint, the crushing time of the ball mill is preferably 1 to 30 hours, 3 to 20 hours, and particularly preferably 5 to 10 hours. Alternatively, a crushing process using a crushing device other than a ball mill (such as a spray mill) may be added depending on the target particle size.

[0056] Grading can be performed using known methods such as air grading, washing grading, and sieving. Grading primarily aims to remove fine particles. If the glass powder contains fine particles, it is prone to agglomeration during the subsequent spheroidizing process. In this case, the gaps between the fine particles may remain as air bubbles within the glass filler powder. It should be noted that by using a grading machine with a built-in pulverizer (such as a jet mill), the raw glass material can be pulverized and graded simultaneously. This simplifies the manufacturing process.

[0057] Next, the obtained glass powder is heated to spheroidize it, resulting in glass filler powder. Examples of heating and melting methods include feeding the glass powder into a furnace using a benchtop feeder, heating it at 1400–2000°C using an air burner to soften and flow it, spheroidizing the glass powder through surface tension, and then cooling and recycling it.

[0058] The spheroidized glass filler powder can also be further graded to achieve the desired particle size distribution. Additionally, post-processing steps such as cleaning and surface treatment can be added as needed. For example, surface treatment using a silane coupling agent can be employed. Treatment with a silane coupling agent improves the bonding force between the glass filler powder and the resin, resulting in molded articles with superior mechanical strength. Furthermore, the fusion between the glass filler powder and the resin is improved, reducing interfacial bubbles and voids, and suppressing excessive light scattering. Suitable silane coupling agents include, for example, aminosilanes, epoxysilanes, and acrylic silanes. It should be noted that the silane coupling agent can be appropriately selected depending on the resin used.

[0059] (resin)

[0060] The resin used in the resin composition of the present invention will be described.

[0061] Examples of resins include photocurable resins and thermocurable resins, which can be selected appropriately based on the molding method used. For example, when using photoforming, a liquid photocurable resin can be selected; conversely, when using powder sintering, a powdered thermocurable resin can be selected.

[0062] Examples of photocurable resins include: polyamide resins, polyamide-imide resins, polyacetal resins, (meth)acrylic resins, melamine resins, (meth)acrylic-styrene copolymers, polycarbonate resins, styrene resins, polyvinyl chloride resins, benzoguanamine-melamine-formaldehyde resins, silicone resins, fluorine resins, polyester resins, crosslinked (meth)acrylic resins, crosslinked polystyrene resins, crosslinked polyurethane resins, and epoxy resins.

[0063] Examples of thermosetting resins include: epoxy resins, thermosetting modified polyphenylene ether resins, thermosetting polyimide resins, urea resins, allyl resins, silicone resins, benzoxazine resins, phenolic resins, unsaturated polyester resins, bismaleimide triazine resins, alkyd resins, furan resins, melamine resins, polyurethane resins, and aniline resins.

[0064] (Resin Composition)

[0065] The resin composition can be obtained by mixing glass filler powder and resin in a mixer. The preferred resin-to-glass filler powder ratio (mass ratio) is 95:5–25:75, 90:10–40:60, or 85:15–50:50, and particularly preferred is 80:20–60:40. If the glass filler powder content is too low, the mechanical strength of the molded article tends to decrease. On the other hand, if the glass filler powder content is too high, the viscosity of the resin composition becomes too high, the flowability decreases, and molding becomes difficult. Examples of mixers include three-roll mills and rotary mixers.

[0066] (Manufacturing method of shaped objects)

[0067] Next, an example of a method for manufacturing a molded article using the resin composition of the present invention will be described. Specifically, a method for manufacturing a three-dimensional object using a resin composition containing a photocurable resin (utilizing a so-called 3D printing method) will be described.

[0068] First, a liquid layer containing a photocurable resin composition is prepared. For example, a shaping stage is placed in a tank filled with the liquid photocurable resin composition, with the upper surface of the stage positioned at a desired depth (e.g., about 0.2 mm) from the liquid surface. This allows the liquid layer to be prepared on the worktable.

[0069] Next, the liquid layer is irradiated with active energy rays, such as ultraviolet lasers, to cure the photocurable resin and form a cured layer with a predetermined pattern. In addition to ultraviolet light, visible light, infrared lasers, and other types of lasers can also be used as active energy rays.

[0070] Next, a new liquid layer containing a photocurable resin composition is prepared on the formed cured layer. For example, by lowering the modeling stage by one layer, the photocurable resin composition can be introduced onto the cured layer to prepare a new liquid layer.

[0071] Then, the new liquid layer prepared on the cured layer is irradiated with active energy rays to form a new cured layer that is continuous with the above-mentioned cured layer.

[0072] By repeating the above operations, the cured layers are continuously stacked to obtain the specified shaped object.

[0073] It should be noted that, in addition to the methods described above, the resin composition of the present invention can also be used to produce molded articles by known methods such as injection molding.

[0074] The resulting molded material preferably has a light transmittance of 60-89%, 70-86%, and particularly preferably 80-85% at a wall thickness of 0.5 mm and a wavelength of 600 nm. This makes it easy to obtain the desired aesthetics and suitable for use as a temporary tooth.

[0075] Example

[0076] The present invention will be described below based on embodiments, but the present invention is not limited to the embodiments.

[0077] Table 1 shows the examples (No. 1 to 6) and comparative examples (No. 7 to 9).

[0078] [Table 1]

[0079]

[0080] (Preparation of glass filler)

[0081] The raw material powders were prepared and uniformly mixed according to the following mass percentages: SiO2 52.4%, Al2O3 16%, B2O3 16%, K2O 3.6%, CaO 1.5%, ZnO 1.5%, TiO2 1.2%, Nb2O5 3.7%, and WO3 4.1%. The resulting batch of raw materials was melted and homogenized at 1580–1600°C, then flowed out between a pair of rollers to form a film, thus obtaining glass material. The obtained glass material was pulverized using a ball mill and then air-classified to obtain glass powder. However, in No. 9, air classification was not performed. It should be noted that the ball milling time is shown in Table 1. Furthermore, the specific surface area of ​​the glass powder immediately after ball milling is shown in Table 1.

[0082] The obtained glass powder is fed into the furnace using a benchtop feeder, and heated to 1400–2000°C using an air burner to melt and spheroidize the glass powder. The spheroidized glass powder is then washed and graded to obtain glass filler powder (refractive index nd = 1.51).

[0083] For the obtained glass filler powder, the specific surface area, roundness, average particle size, and bubble volume content were determined. The results are shown in Table 1.

[0084] Specific surface area was determined by the BET method.

[0085] Roundness was determined using the maximum particle size D from SEM images of the glass filler powder. max and minimum particle size D min The answer can be found using the formula already given.

[0086] The average particle size was determined by laser diffraction scattering particle size distribution measurement.

[0087] The volumetric density of the bubble was determined using the true density and apparent density of the glass filler powder, according to the following formula. It should be noted that in the following formula, the true density of the glass filler powder was determined using the Archimedes method with the glass material formed into the aforementioned film. Furthermore, the apparent density of the glass filler powder was determined using the constant volume expansion method with the obtained glass filler powder.

[0088] Bubble volume percentage (%) = ((true density - apparent density) / true density) × 100

[0089] (Preparation of the resin composition)

[0090] A resin composition was obtained by adding 30 parts by weight of glass filler powder to 70 parts by weight of curable resin (Digitalwax DL360, refractive index nd = 1.514 after curing) and mixing them using a rotation-revolution mixer (Thinky ARE-310).

[0091] (Transmittance Measurement)

[0092] An appropriate amount of the obtained resin composition was collected onto a glass slide, and a 0.5 mm thick glass plate was used as a spacer to hold it between another glass slide. The resin composition was then cured by irradiating it with ultraviolet light with a wavelength of 365 nm. In this way, a plate-shaped molded object was obtained.

[0093] Next, the total light transmittance of the obtained molded article was measured using a spectrophotometer (Shimadzu UV-3100). The transmittance at a wavelength of 600 nm was read from the obtained spectrum. The results are shown in Table 1.

[0094] As shown in Table 1, the glass filler powders of Examples 1-6 had a porosity of 0.4-1.9%, and the resin compositions exhibited expected transmittance of 65-86%. On the other hand, the glass filler powder of Comparative Example 7 had a porosity as low as 0.1%, and the resin composition exhibited a transmittance as high as 90%. Furthermore, the glass filler powder of Comparative Example 8 had a porosity as high as 2.4%, and the resin composition exhibited a transmittance as low as 59%. Additionally, the glass filler powder of Comparative Example 9 had a porosity of 2.1% and a specific surface area of ​​2.9 m². 2 / g, both are large, and the permeability of the resin composition is as low as 55%.

Claims

1. A glass filler powder, characterized in that, The glass filler powder contains air bubbles internally, and the volume content of these air bubbles is 0.2% to 0.9%. The glass filler powder contains, by mass%, 40-80% SiO2, 2.5-30% Al2O3, 2-20% B2O3, 0-15% CaO, 0-10% ZnO, 0-10% Li2O, 0-30% Na2O, 0-30% K2O, 0-20% Nb2O5, 0-20% WO3, 0.1-30% Nb2O5+WO3, 0.1-15% TiO2, and 0-10% F.

2. The glass filler powder according to claim 1, characterized in that, The glass filler powder is spherical.

3. The glass filler powder according to claim 1 or 2, characterized in that, The specific surface area of ​​the glass filler powder is 2m². 2 / g or less.

4. The glass filler powder according to claim 1 or 2, characterized in that, The average particle size of the glass filler powder is less than 8 μm.

5. The glass filler powder according to claim 1 or 2, characterized in that, The refractive index nd of the glass filler powder is 1.48~1.

62.

6. The glass filler powder according to claim 1 or 2, characterized in that, The glass filler powder is used in a manner that incorporates it into the resin.

7. A resin composition, characterized in that, Contains: glass filler powder according to any one of claims 1 to 6; and resin.

8. A molded article, characterized in that, The resin composition comprising claim 7.

9. The molded article according to claim 8, characterized in that, The light transmittance of the shaped article is 60-89% at a wall thickness of 0.5 mm and a wavelength of 600 nm.

10. A method for manufacturing a filler powder, used to manufacture the glass filler powder according to any one of claims 1 to 6, characterized in that, include: The process of crushing and classifying raw glass materials to obtain glass powder; and the process of heating and melting the obtained glass powder to spheroidize it. Among them, a ball mill is used to crush the raw glass material.

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