JP3425986B2 - Phenolic resin high flow molding and molding method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phenol resin high-fluidity molded article and a molding method thereof, and more particularly, to an inexpensive and highly precise phenolic resin high-fluidity molded article for optical parts The present invention relates to a phenolic resin high-fluidity molded product that can be suitably finished into a processed product and a molding method thereof.

[0002]

2. Description of the Related Art Phenolic resin is inexpensive and has been widely used for various products such as electric materials since ancient times as a resin excellent in various properties such as heat resistance, rigidity, hardness, electric insulation and chemical resistance. Most of the products use liquid raw materials and paper,
It was a composite thermosetting resin molded product formed by blending cloth, glass fiber, a reinforcing material such as an inorganic filler, and a filler. Although this molded product is inexpensive, it contains a large amount of unreacted phenol, and the inclusion of bubbles is unavoidable. Therefore, it cannot be expected that the molded product has a high level of properties, so it could not be used as a high-performance product. On the other hand, recently, a molding material having a high purity and a solid (powder granule) heat fluidity at room temperature (hereinafter, abbreviated as a heat fluid granular molding material) has appeared, and as a raw material for various high performance parts. It is becoming widespread.

In addition to the compression molding method which has been most commonly used as a molding method for phenolic resins, this material has a transfer molding method, an injection molding method or an extrusion molding method (hereinafter referred to as "molding method").
It is simply referred to as a high flow molding method. Further, “transfer molding, injection molding or extrusion molding” or “transfer molding, injection molding or extrusion molding” is also abbreviated as high flow molding or high flow molding. ) Is a molding resin that can be molded in a highly fluid state such as the above, and therefore can be applied to a molding method with high accuracy and high productivity. It is a material that can be used to form a wide variety of products, including molded products that require complex high dimensional accuracy such as parts.

By the way, the conventional phenol resin molding material, even such a heat-fluidable granular molding material capable of high flow molding, is usually fiber-reinforced such as glass fiber as described in Japanese Patent Publication No. 1-38816. In the present situation, satisfactory molding cannot be achieved unless a material or an organic lubricant containing metal such as zinc stearate is included. That is, in a cylinder of a molding machine when high flow molding of a phenol resin molding material from which a glass fiber or a metal-containing organic lubricant is removed from such a molding material,
The smooth fluidity of the molding material is impaired, making it difficult to mold stably and with high precision.

On the other hand, if a transparent phenol resin molded product corresponding to a transparent molded product using a transparent resin such as a polymethacrylic resin or a polycarbonate resin can be molded, it has the characteristics of the above-mentioned phenol resin and is transparent. It is expected that it will be used in various applications as products such as optical parts, containers, window materials, etc. that have higher performance and are more inexpensive than the conventional products, but at present, it is like a plate-shaped body by compression molding (hot press molding). However, only a relatively simple product can be obtained, and since the cycle time is long, only expensive products can be produced. By the way, if it is attempted to mold it by the high flow molding method, the molded product containing the above-mentioned fiber reinforcement and metal-containing organic lubricant loses its transparency, so such a high flow molded product has not yet been developed. Not not.

In addition to the above-mentioned transparent resin products, transparent phenol resin molded products can be obtained by burning them at high temperature in a vacuum or in an inert gas atmosphere to obtain high-purity amorphous carbon (glassy carbon), graphite, etc. As a carbon material, it can be used in various applications such as magnetic disk substrates and crucible containers. For example, in the case of a magnetic disk substrate, it is required that the flatness of the plate surface of the plate-shaped molded article is extremely high, and therefore a method of precision polishing the surface of the molded product to finish it is used. Since the presence of bubbles, impurities, and localized metals appear as defects on the polished surface, only low-grade products have been obtained in the conventional products. Phenol resin is one of the most used as a raw material for preparing a carbon material that can be easily carbonized by the above-mentioned firing treatment, but in the case of a conventional phenol resin material, a polymerization process and a molding process are performed. Above all, the contamination of the above-mentioned defect factors is unavoidable, and it has not been used for high-performance carbon materials.

[0007]

In view of the above situation, the present invention provides a phenol resin high flow molded article and a molding method thereof, which can be suitably finished to a secondary processed product such as a magnetic disk carbon substrate. The purpose is.

[0008]

Means for Solving the Problems As a result of intensive studies to solve the problems, the present inventors have found that the problems can be solved by a phenol resin high-fluidity molded article having excellent transparency and containing almost no bubbles or metal. The present invention has been found to be solved and has reached the present invention.

That is, the present invention has a light transmittance of 80% or more per 1 mm of the optical path of visible light having a wavelength of 800 nm and a pore diameter per 1 cm ^3.
A gist of a phenol resin high-fluidity molded article characterized by having less than 1 pore having a size of 100 μm or more, preferably 20 μm or more and a metal content of 200 ppm by weight or less. The present invention also has a melting point of 30 to 160 ° C. on the surface layer of a granular phenol resin having a water content of 1% by weight or less, a particle size of 50 μm or more and a thermal fluidity of 60 to 160 mm as measured by the disc cure method. The method for molding a high flow molding of a phenol resin, characterized in that the phenol resin molding material coated with the low surface tension substance of 0.2 to 5% by weight relative to the phenol resin is subjected to transfer molding, injection molding or extrusion molding. Is the gist.

The present invention will be described in detail below. The light transmittance is a value that expresses the intensity ratio of incident light and emitted light per 1 mm of sample thickness of visible light of wavelength 800 nm as a percentage (hereinafter simply referred to as light transmittance), and quantitatively displays the transparency of a substance. It is also a measure of the purity of a substance. The light transmittance of phenol resin is 95% due to the presence of molecular light absorbers such as quinoid side reaction products, even if it is completely pure.
If it is less than 95%, the difference indicates the loss of light absorption and scattering by minute contaminant impurities other than phenol resin, fine pores, voids, etc., and this value is less than 80%. In the case of, when the carbon material is used, a significant defect appears in the surface smoothness of the polished surface.

The existence of pores also becomes a defect as described above, and especially pores having a pore diameter of 100 μm or more become serious defects. However, if the number of pores having a pore size of 100 μm or more per 1 cm ³ is less than 1 in the original molded body, there is almost no effect on the smoothness.

[0012] The mixing of the metal may be a simple metal, a metal compound such as a metal oxide, a metal carbide, a metal sulfide, a metal carbonate or a metal sulfate, or an organic acid salt.
Even if it exists in any form such as complex salts and organometallic compounds such as chelates, minute single metals, metal oxides, metal carbides that are contaminated in the carbon material when finished into a carbon material,
It becomes a localized metal such as, and the carbon in the vicinity becomes heterogeneous, resulting in a defect. However, the metal content of the original compact is 200 weight pp
When it is less than m, the surface smoothness of the polished surface is hardly affected.

Moreover, since the phenol resin molded product of the present invention is a high-flow molded product, it has a more uniform structure and has a higher degree of polymerization, crosslinking degree, branching degree, etc. than conventional molded products such as compression molded products. There are almost no irregularities in the structure / physical properties such as chemical structure, lateral order, voids, grain boundaries and other microstructures, and local strain and other microscopic physical properties. Such good homogeneity of the molded body of the present invention not only brings important advantages in the optical properties of the transparent body, but also exerts a great advantage when it is finished into a carbon material. That is, the carbon material comprising the molded body of the present invention has excellent smoothness on the polished surface of the molded body, and even if the sheet is thin, deformation such as distortion or bending hardly appears.

Next, the molding method of the phenol resin high flow molding of the present invention will be described in detail. According to the molding method of the present invention, the melting point is 30 to 160 on the surface layer of granular phenol resin having a water content of 1% by weight or less, a particle size of 50 μm or more and a thermal fluidity of 60 to 160 mm as measured by the disc cure method. The gist is a method of transfer molding, injection molding or extrusion molding of a phenol resin molding material, which is coated with a low surface tension substance at a temperature of 0.degree.

The granular phenol resin has a particle size of 50 μm.
Phenolic resins having a m or more, preferably 100 μm or more and a thermal fluidity of 60 to 160 mm as measured by the disc cure method can be preferably used. Here, the particle size is
Shows the average maximum diameter (circumscribed sphere diameter) of the granules. Particle size is 50 μm
If it is less than the above, the supply to the molding machine cannot be performed stably. There is no particular upper limit on the particle size. For example, a practical particle size of 100 to 4000 μm is suitable. The grain shape is spherical,
Either a cylindrical shape or a cubic shape may be used, but if the particle size is small, the spherical shape is superior in transportability during molding.

The term "thermofluidity" as used in the present invention means a characteristic that it is solid at room temperature but shows fluidity when a load is applied in a heated state, except that it is the case of a usual thermoplastic resin. Since they have different self-hardening properties, if they are heated at a temperature at which they have fluidity for a certain period of time or longer
Alternatively, it has the property that intermolecular condensation begins to form crosslinks and cure. As a measure of this heat fluidity, it was measured by the JIS standard (disc cure method) described later.
It is expressed as the flow (diameter extension; mm) of a sample resin disk under a predetermined load at 0 ° C. A resin having a heat fluidity of less than 60 mm has poor moldability, while a resin having a heat fluidity of more than 160 mm has a poor productivity due to the long time required for the curing reaction, and
Moisture and the like generated by the curing reaction are trapped in the molded product, which may result in a defective product.

As a method for producing a granular phenol resin, for example, as in the method described in JP-A-4-159320, a novolak resin is prepared in the presence of an alkali catalyst such as hexamethylenetetramine and a methylene crosslinking agent and a suspension stabilizer. , A method of carrying out suspension polymerization in an aqueous medium (self-curing modified novolac resin method), a method of carrying out suspension polymerization of phenol and formaldehyde in an aqueous medium in the presence of a basic catalyst and a suspension stabilizer. A polymerization method (solid resole resin method) can be preferably adopted. By these methods, spherical fine particles having an extremely high purity and a nearly spherical shape can be obtained. In order to obtain a forming raw material having a large particle size, it is effective to granulate the above-mentioned fine particles to prepare a raw material having a predetermined particle size.

The low surface tension substance is a low melting point compound which is solid at room temperature and has a melting point of 30 ° C. to 160 ° C., and has a low surface tension substance such as lubricity, releasability and non-adhesiveness (for example, at room temperature [25 ℃]
And a compound having a critical surface tension of about 35 dynes / cm or less), which is a compound having a characteristic peculiar to the compound and does not contain a metal element such as a metal salt is preferable.

Typical examples are higher fatty acids such as lauric acid, palmitic acid and stearic acid; higher fatty acid esters such as lauric acid monoglyceride, ethyl stearate, stearic acid monoglyceride, sorbitan monopalmitate and sorbitan monostearate; Solid fats and oils such as trilaurin, tristearin and hydrogenated castor oil;
Higher fatty acid amides such as stearic acid amide and ethylenebisstearic acid amide; higher aliphatic alcohols such as cetyl alcohol and stearyl alcohol; higher aliphatic (meth) acrylates such as stearyl methacrylate and stearyl acrylate; waxy hydrocarbons such as paraffin wax Polyvalent fluorine-containing higher fatty acids such as perfluorooctanoic acid and 9H-hexadecafluorononanoic acid; polyvalent fluorine-containing higher aliphatic sulfonamides such as N-ethylperfluorooctylsulfonamide; 2- (perfluorooctyl) Polyvalent fluorine-containing higher aliphatic iodide such as ethyl iodide and 2- (perfluorodecyl) ethyl iodide;
1H, 1H, 9H-hexadecafluorononanol, 2-
(Perfluorooctyl) ethanol, 2- (perfluorodecyl) ethanol and other polyvalent fluorine higher aliphatic alcohols; 2- (perfluorodecyl) methyl methacrylate, 1H, 1H, 11H-eicosafluoroundecyl acrylate, etc. Polyvalent fluorine-containing higher aliphatic (meth) acrylate; Polyvalent fluorine-containing higher aliphatic hydrocarbon such as perfluorododecane; Multi-valued containing 2- (P-hydroxybenzoic acid methyl hexafluoropropene trimer adduct) Fluorine aliphatic aromatic compounds, polyvalent fluorine aromatic hydrocarbons such as pentafluorobenzamide; polyvalent fluorine oligomer compounds such as TFE wax (tetrafluoroethylene telomer), CTFE telomer (chlorotrifluoroethylene telomer), etc., or These derivatives, a mixture of one or more of these And low surface tension materials, such composition containing an additive such as these polymerization catalysts.

The phenol resin molding material is a composite granular composition in which the surface of the granular phenol resin particles is coated with the low surface tension substance in a proportion of 0.2 to 5% by weight, preferably 0.3 to 3% by weight, relative to the composition ratio of phenol resin. So, not only the compression molding that has been used in the past, but also transfer molding,
It is a molding material that can be used for high-flow molding such as injection molding or extrusion molding.

When the content of the low surface tension substance is less than 0.2% by weight, it may be difficult to continuously perform molding due to blockage in the cylinder of the molding machine during molding, while it exceeds 5% by weight. Therefore, the effect of improving the moldability reaches a ceiling, and it tends to be difficult to obtain a transparent molded product.

The coating of the low surface tension substance on the granular phenol resin is preferably carried out so that it is distributed as uniformly as possible among the particles and the film thickness is even.

As a coating method, a granular phenol resin having a predetermined composition and a low surface tension substance are mixed in a blender with a heating device at a predetermined temperature within a temperature range from the melting point of the low surface tension substance to the softening point of the granular phenol resin. Method of mixing and stirring while heating, method of stirring both raw materials in the fluidized bed at the above temperature, low surface tension due to a solvent showing no solubility for granular phenol resin and good solubility for low surface tension substances A method of dissolving the substance, mixing the granular phenol resin with this solution, and distilling off the solvent and drying is recommended.

At this time, as will be described later, it is an essential requirement that the present phenol resin molding material has a water content controlled to 1% by weight or less at least at the time of molding.
Usually, the raw material phenol resin after polymerization contains several% by weight or more of water, so it is effective to dry it so as to reduce the water content within the above limits and to apply the above coating before use. Is the way. As the drying method at this time, the granular phenol resin is used in vacuum or under circulating dry air at 60 to 120 ° C.
It is recommended that the method be performed by heating to the temperature. In this method, it is also efficient to coat the phenol resin with a low surface tension substance and dry the phenol resin together.

Since the coating material of the molding material prepared by this method is made of a water-repellent, low-moisture-permeable, low surface tension substance, it can be kept at a set water content or less for a long time as it is, but industrially From the viewpoint of quality control, it is preferable to store in a sealed container or a sealed package until just before molding.

Of course, even with a phenol resin molding material obtained by directly coating the granular phenol resin without drying as described above, if it is sufficiently dried immediately before molding and molded under a condition that does not absorb moisture, the same as above. The molded article of the present invention can be formed.

When high flow molding such as transfer molding, injection molding or extrusion molding is carried out under normal molding conditions using a phenol resin molding material, the phenol resin high flow molding of the present invention is transparent and contains almost no bubbles. The body is obtained. At this time, as described above, it is recommended to use a phenol resin molding material having a water content of 1% by weight or less, preferably 0.2% by weight or less. If the water content exceeds 1% by weight, pores remain in the molded product during molding, and depending on the molding conditions, deterioration phenomena such as hydrolysis may occur. The molded product of the present invention can be used for various purposes as it is, but if it is cured at a predetermined temperature within a temperature range of 140 to 240 ° C. after molding, crosslinking further progresses and various products having a high degree of curing can be obtained.

[0028]

In the conventional high-flow molding of the phenol resin heat-fluidic granular molding material, the glass fiber reinforcing material was used as described above, and the metal-containing organic lubricant was also used in combination. If these compounding agents are excluded from the above setting requirements for the body and molding is attempted, blockage occurs after the heating zone and molding cannot be performed at all.

On the other hand, in the phenol resin molding material of the present invention, since each powder and granular material is uniformly coated with the low surface tension substance having high lubricity, not only the solid transportation part but also the compressed transportation in the heating zone. Uniform transport (Plug flow) is achieved even in the entire transport section up to the part, and the granular phenolic resin and low surface tension substances are not separated and maintain fluidity even in the compressed transport section immediately before the resin in the heating zone is melted. Moreover, it moves while being lubricated in a liquid state in a state where the granular phenol resin is coated with the melted low surface tension substance. Then, in the same heating zone, the phenol resin coated with the low surface tension substance melts and starts aggregation and kneading, and at the same time, the liquid low surface tension substance and the phenol resin are separated into two layers to form a uniform phenol resin layer. A liquid coating of low surface tension material is formed on the surface. Thus, the liquid coating of the low surface tension substance reduces the flow resistance of the fluid on the wall surface of the cylinder to form a homogeneous and highly fluid molding fluid, and in the case of transfer molding or injection molding, in the mold, in the case of extrusion molding. Is injected or extruded from soybean (nozzle) to the external system. The low surface tension substance forms a film on the surface of the molded product and improves the releasability when the molded product is released from the mold.

As described above, in the molding of the present invention, since the resin melting / kneading and the low surface tension substance dispersion proceed extremely smoothly from the compression transport section of the heating zone to the resin melting / kneading section, the molded body is homogeneous and the resin Almost no mixing of pores occurs inside.

Unlike the conventional lubricants, the low surface tension substance is a substance which plays a role of a lubricant, a fluidity improver, a non-adhesive agent, a release agent, and a molding aid which exhibits various functions. The low surface tension substance evaporates as it is when the molded product is fired into a carbon material, or decomposes and evaporates to leave almost no trace on the carbon material.

The phenol resin molding material can be molded by compression molding, which is the mainstream of conventional phenol resin molding, but can be suitably molded in high flow molding such as transfer molding, injection molding or extrusion molding, which has been difficult to mold by conventional molding. It is a molding material that has advanced further.

From the viewpoint of the molded product, in the case of the compression molded product, the granular phenol resin as a raw material is not subjected to homogenizing treatment such as kneading, but each powder or granular material is melted as it is by sintering molding, and is directly used. In the case of a high-fluidity molded body, the granular phenolic resin as a raw material is once completely melted and then melted at high speed (transfer molding) or kneading (injection molding or extrusion molding) Since it is a molded product obtained by homogenizing and molding a fluid, it is homogeneous and has a uniform chemical structure. Moreover, the high-fluidity molded product not only provides a molded product having a complicated shape, but also has excellent productivity.

The high-flow molding method is a molding method in which a low-viscosity molding fluid is filled at a high pressure and a high speed, and the injection pressure is highly controlled, so that the molded product is highly accurate and reproducible in terms of product shape. There is.

[0035]

EXAMPLES Next, the present invention will be specifically described by way of examples. Reference example 1 Novolak resin (# 600 manufactured by Mitsui Toatsu Chemicals, Inc.) 150
1 part by weight of completely saponified polyvinyl alcohol (polymerization degree of about 2000) is melted at 160 ° C., and then poured into hot water (220 parts by weight) at 90 ° C. with stirring to disperse the suspension system. After formation, 24 parts by weight of hexamine are dissolved in 40 parts by weight of warm water and added, and the suspension is polymerized by continuing stirring at the same temperature for 20 minutes to complete the reaction, and the suspension is solid-liquid separated. Then
It was naturally dried to obtain a granular phenol resin. The characteristics of this phenol resin are shown in Table 1. However, the characteristics of the phenol resin shown in Table 1 were measured by the following methods. The heat fluidity (hereinafter, abbreviated as HPF) is JIS-K-6911.
₁₉₇₉ Based on the method of 5.3.2 [Molding material (disk type)], 2 g of the sample was hot pressed at 160 ° C for 1 minute under a load of 1145 kg, and the diameter of the disk (longest diameter and shortest diameter) It was calculated from the average value). The average particle size was obtained by developing the sample on a glass plate, taking a micrograph, measuring 100 arbitrarily selected particle sizes, and showing the average value. The water content was determined by heating 10 g of the sample at 80 ° C. for 30 minutes using an infrared heater and reducing the weight.

[0036]

[Table 1]

Reference Example 2 As in Reference Example 1, except that the amount of completely saponified polyvinyl alcohol was increased to 1.5 parts by weight to prepare a phenol resin having HPF of 145 mm, an average particle size of 138 μm and a water content of 2.3% by weight. Classify using 50μm, 100μm, 150μm sieve, 50μm under (Experiment No. 9), 50 ~ 100
μm (Experiment No. 10), 100-150 μm (Experiment No. 1)
1) and 150 μm or more (Experiment No. 12) fractions were obtained.
In addition, the resin of Experiment No. 9 fraction was granulated to give a diameter of 2 mm,
A 3 mm long cylindrical pellet (Experiment No. 13) was prepared. These above characteristics are shown in Table 2.

[0038]

[Table 2]

Each of the granular phenolic resins of Experiment Nos. 1 to 13 was mixed with a blender equipped with a heating jacket while heating at 100 ° C. under the conditions shown in Table 3 below to coat the low surface tension substance. A phenol resin molding material was prepared by drying at 70 ° C. with air having a relative humidity of 2% or less.

Examples and Comparative Examples Using an EM35-25KS-10 type injection molding machine manufactured by Matsuda Seisakusho, a cylinder temperature of 120 ° C., a mold temperature of 170 ° C., an injection pressure of 70 to 150 kg / cm ² , and a diameter of 100 mm. A circular plate having a thickness of 2 mm and a basis weight of 20 g was molded, and the molded product was evaluated for moldability, light transmittance, number of pores, and metal content by the following evaluation criteria and measurement methods. The results are shown in Table 3.

[0041]

[Table 3]

Moldability (Evaluation Criteria) Good: Injection molding is possible in a predetermined cycle (90 seconds) continuously. Δ: Injection molding is possible, but molding cannot be continuously performed in a predetermined cycle under the above conditions. X: Injection molding cannot be performed due to poor biting of the phenol resin molding material, blockage in the cylinder, and the like.

Light Transmittance (Measurement Method) The light transmittance as defined above was measured for a disk sample at 25 ° C. using a Hitachi U-3400 type self-recording spectrophotometer. Per sample
The average value of 10 measured values was obtained. Number of pores (measurement method) Using an Olympus stereomicroscope with a magnification of 300 times, count the number of pores with a diameter of 20 μm or more per 10 cm ² under the visual field of the same sample, and calculate the number of pores on the left per 1 cm ³ by volume conversion. It was Number of repetitions: 10 points Metal content (Measurement method) Japan Jarrell Ash Co., Ltd. Optical emission spectrometer ICAP-
575 was used to measure emission spectroscopy. The measured metal content was 100 ppm or less in all the samples, and therefore it is not shown in Table 3.

In Table 3, the abbreviations of the low surface tension substances represent the following compounds (melting points). SMG: monoglyceride stearate (60 ° C) SE: ethyl stearate (34 ° C) SAL: stearyl alcohol (56 ° C) SMP: sorbitan monopalmitate (46 ° C) SAC: stearic acid (66 ° C) M: mannitol (166 ° C) ) SAM: Amide stearate (100 ℃)

In Table 3, No. 1, No. 8, No. 9,
The samples of No. 14, No. 18, No. 20 and No. 25 correspond to the comparative examples, and the existence of the following problems became clear. Sample No. 1 has a phenolic resin HPF composing the phenolic resin molding material of 45.
Since it was as low as mm, the fluidity in the cylinder of the injection molding machine was poor and it was blocked, and injection molding could not be performed. Sample No. 8 is
Since the HPF exceeds 160 mmw, the injection molding was successful, but even after the surface layer of the molded product was hardened in the mold, condensation proceeded inside and numerous pores were formed inside the molded product.
Sample No. 9 has a phenolic resin molding material particle size of 50 μm
It was a fine particle of less than, and continuous injection molding could not be performed due to poor bite. Sample No. 14 could not be injection-molded because the low surface tension substance was less than 0.2% by weight because of clogging in the cylinder. In sample No. 18, since the low surface tension substance was present in a large amount exceeding 5% by weight, the transparency of the molded product was impaired, and it was difficult to evaluate bubble defects in the molding material. In sample No. 20, the water content of the phenolic resin molding material was more than 1% by weight, and a large number of pores were formed inside the molded product. In Sample No. 25, the melting point of the low surface tension substance was 160 ° C. or higher, so that it was not possible to obtain a uniform coating when the phenol resin was dried, and it was difficult to melt during injection molding, so sufficient moldability was not obtained.

As is clear from the examples of Table 3 (that is, the samples other than the samples of the above-mentioned comparative examples), the phenolic resin molding material of the present invention contains no fiber reinforcing material and metal-containing organic lubricant at all. A stable injection-molded product was obtained, which was transparent and had almost no pores with a diameter of 100 μm or more (hereinafter referred to as atmospheric pores) and containing metal. Further, it was confirmed that all the molded articles of this example were fired at 1200 ° C. in an inert gas to become a high-purity amorphous carbon material.

[0047]

EFFECT OF THE INVENTION The phenol resin high flow molding of the present invention is transparent, has almost no air holes, has a very small metal content, and is fired at a high temperature in a vacuum or an inert atmosphere to obtain a high purity carbon material. Magnetic disk base,
It can be used for various purposes such as crucible containers. Also,
INDUSTRIAL APPLICABILITY The phenol resin high-fluidity molded product of the present invention is inexpensive and has various properties such as heat resistance, rigidity, hardness, electric insulation, chemical resistance, and various other products such as containers and window materials. It can be used preferably. Furthermore, the molding method of the present invention is a simple method of molding a phenol resin molding material under a low water content by using a conventionally widely used molding method such as a transfer molding method, an injection molding method or an extrusion molding method. It is a method capable of producing high-quality products at high cost with high productivity.

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Claims (2)

(57) [Claims] 1. A light transmittance of 80% or more per 1 mm optical path of visible light of wavelength 800 nm is less than 1 pore with a pore diameter of 100 μm or more per 1 cm ³ , and a metal content is 200 ppm by weight or less. High flow molding of phenolic resin. 2. A water content of 1% by weight or less and a particle size of 50 μm.
Above 60 m, the thermal fluidity measured by the disk cure method is 60
The melting point is 30 on the surface of granular phenolic resin, which is ~ 160 mm.
Composition ratio of low surface tension substance to phenol resin at ~ 160 ° C is 0.
2. A method for molding a phenol resin high flow molding according to claim 1, wherein the phenol resin molding material coated with 2 to 5% by weight is subjected to transfer molding, injection molding or extrusion molding.