WO2007086444A1 - Piece moulee, son moule et procede de moulage utilisant ledit moule - Google Patents

Piece moulee, son moule et procede de moulage utilisant ledit moule Download PDF

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Publication number
WO2007086444A1
WO2007086444A1 PCT/JP2007/051134 JP2007051134W WO2007086444A1 WO 2007086444 A1 WO2007086444 A1 WO 2007086444A1 JP 2007051134 W JP2007051134 W JP 2007051134W WO 2007086444 A1 WO2007086444 A1 WO 2007086444A1
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WO
WIPO (PCT)
Prior art keywords
mold
bottom wall
molded body
vertical wall
wall
Prior art date
Application number
PCT/JP2007/051134
Other languages
English (en)
Japanese (ja)
Inventor
Masaki Takeuchi
Original Assignee
Rimtec Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rimtec Corporation filed Critical Rimtec Corporation
Priority to JP2007555987A priority Critical patent/JPWO2007086444A1/ja
Publication of WO2007086444A1 publication Critical patent/WO2007086444A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0025—Applying surface layers, e.g. coatings, decorative layers, printed layers, to articles during shaping, e.g. in-mould printing
    • B29C37/0028—In-mould coating, e.g. by introducing the coating material into the mould after forming the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
    • B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]

Definitions

  • the present invention relates to a molded body, a mold for manufacturing the molded body, and a method for manufacturing the molded body using the mold. More specifically, a molded body having a bottom wall and a vertical wall rising at a predetermined angle from at least a part of an outer edge of the bottom wall, and having a uniform coating film on an inner surface formed by the bottom wall and the vertical wall.
  • the present invention also relates to a mold for manufacturing the molded body, and a method for manufacturing a molded body having a coating film on the surface of the inner surface portion using the mold.
  • the resin molded body formed with the coating film by this method has a problem that the adhesiveness of the coating film is lowered due to aging and the production cost is high! It was.
  • an in-mold coating method is known.
  • the volume shrinks when the reaction stock solution becomes a molded body. This is called molding shrinkage. Due to this molding shrinkage, a gap of usually 5 to 500 / ⁇ ⁇ is generated between the mold and the molded body.
  • the in-mold coating method is a method in which a coating agent is injected into the gap between the molded body generated by the molding shrinkage and the mold surface, and is cured to form a coating film on the molded body. After the in-mold coating, the molded body having the coating film is taken out from the mold.
  • an object of the present invention is to provide a molded body having a uniform coating film free from coating defects such as coating defects, wrinkles and cracks, even for a large molded body.
  • Another object of the present invention is to perform reaction injection molding and in-mold coating in a mold to obtain a molded body having a uniform coating film without coating defects even in a large molded body. It is to provide a mold for this purpose.
  • another object of the present invention is to provide a molding method for obtaining a molded body having a uniform coating film free from coating defects even with a large molded body using this mold.
  • It has a bottom wall and a vertical wall that rises at a predetermined angle with at least a partial force at the outer edge of the bottom wall.
  • at least one additional rib force extending in the outward direction of the bottom wall is formed as a wall extension rib, and the vertical wall extension rib force is also applied to the bottom of the molded body.
  • At least one depression is formed on the outer surface of the bottom wall of the molded body and at a position within 40 mm from the longitudinal wall extension rib toward the center of the outer surface of the bottom wall of the molded body! (3) the molded product according to
  • the bottom wall has a polygonal outer edge, and a thick portion is formed at the outer surface intersection of adjacent vertical walls rising from the outer edge of the polygon (1) to ( 4) the molded body according to any one of
  • a cavity is formed to form at least one rib extending in the vertical direction of the cavity for forming the vertical wall of the molded body in which at least one of the cavities is formed by a male mold and a female mold.
  • at least an additional rib for extending in the outward direction of the bottom wall of the molded body is formed.
  • One cavity is a vertical wall Positioned within the bottom wall forming portion center direction toward the force connexion 50mm of length portion ribs forming wire carrier Bitika also female mold, formed by! Ru that mold characterized by,
  • the male mold has a male mold and a female mold that can be divided in the direction, and the male mold has an inlet for coating for forming a coating film.
  • a cavity for forming at least one rib extending in the outward direction of the bottom wall of the molded body is formed, at least one of which is formed by a male mold and a female mold. It is formed as a rib forming cavity on the extension line of the forming cavity. Further, on the split surface side surface of the female mold, and within the male mold direction at a position within 50 mm toward the center of the bottom wall forming part of the female mold from the mold body vertical wall forming cavity.
  • a mold characterized by having at least one projecting portion facing the surface;
  • a mold for manufacturing a molded body having a bottom wall having a polygonal outer edge and having adjacent vertical walls rising from the outer edge of the polygon, the adjacent wall of the molded body The mold according to (8) or (9), characterized in that a female mold part corresponding to the outer surface intersection of the matching vertical walls has a depression.
  • a molded body having a uniform coating film without any coating defects can be obtained even for a large reaction injection molded body.
  • this molded body has a uniform coating film, no coating defects, and excellent design, it can be suitably used for automobile parts, construction industrial machinery, leisure equipment, housing equipment, and the like.
  • FIG. 1 shows one embodiment of a mold for molding the first molded body of the present invention, on the surface of the inner surface formed by the bottom wall and the vertical wall.
  • FIG. 2 is a schematic cross-sectional view in the longitudinal direction of a rectangle in a state in which a male mold and a female mold for manufacturing a molded body having a coating film are closed.
  • Fig. 3 is a sectional view similar to Fig. 2 showing the main part in the middle of molding.
  • FIG. 5 is a cross-sectional view of the principal part of the III part of FIG.
  • Fig. 6 is a sectional view similar to Fig. 5 showing the main part in the middle of molding.
  • FIG. 7 shows a horizontal cross-section of a vertical wall of a mold for forming a molded body having a bottom wall having a polygonal outer edge and adjacent vertical walls rising from the outer edge of the polygon. It is principal part sectional drawing of a direction.
  • FIG. 8 is a cross-sectional view of the main part in the horizontal direction similar to FIG. 7 during the forming process.
  • FIG. 9 is a cross-sectional view of the main part of the female mold for forming the vertical wall additional rib. It is. Explanation of symbols
  • another molded body according to the present invention includes a bottom wall and a vertical wall that rises at a predetermined angle from at least a part of an outer edge of the bottom wall, and is formed of the bottom wall and the vertical wall.
  • a molded body having a covering film on the surface of the inner surface portion, and having at least one rib extending in the outer direction of the bottom wall, and at least one of the ribs as a vertical wall extension rib on the vertical wall extension line
  • at least one recessed portion is formed on the outer surface of the bottom wall of the molded body and at a position within 50 mm from the vertical wall extension rib toward the center of the outer surface of the bottom wall of the molded body. It is characterized by being formed! / Skin (this compact is sometimes referred to as “second compact”).
  • FIG. 1 shows an embodiment of a mold for forming a bonnet-shaped molded body having a rectangular bottom wall according to an embodiment of the first molded body of the present invention.
  • FIG. 2 is a schematic cross-sectional view in the longitudinal direction of a rectangle in a state where a male mold and a female mold for manufacturing a molded body having a coating film on the surface of the inner surface portion to be formed are closed.
  • FIG. 2 is a cross-sectional view of the main part of the II part of FIG.
  • FIG. 3 is a cross-sectional view of the main part similar to FIG. FIG.
  • FIG. 4 shows an embodiment of a mold for forming a tray-shaped molded body having a rectangular bottom wall according to an embodiment of the second molded body of the present invention, which is formed by a bottom wall and a vertical wall. Rough cut in the longitudinal direction of the rectangle with the male mold and female mold closed for producing a molded body having a coating film on the surface of the inner surface to be formed
  • FIG. 5 is a cross-sectional view of the main part of the III part in FIG.
  • FIG. 6 is a cross-sectional view of the main part similar to FIG.
  • Figure 7 shows the horizontal cross-section of the main part of the vertical wall intersection of a mold for forming a molded body having a bottom wall with a polygonal outer edge and adjacent vertical walls rising from the outer edge of the polygon.
  • FIG. 8 is a horizontal cross-sectional view of the main part similar to FIG. Fig. 9 shows a vertical wall additional rib at the intersection of the vertical walls of a mold for forming a molded body having a polygonal outer edge on the bottom wall and adjacent vertical walls rising from the outer edge of the polygon. It is principal part sectional drawing in the case of forming.
  • the molded article of the present invention is preferably formed from norbornene rosin.
  • the molded body 4 has a bottom wall 42 and a vertical wall 44 that rises at at least a predetermined force angle at the outer edge of the bottom wall 42 (see FIGS. 3 and 6).
  • the shape of the bottom wall portion (that is, the shape when the molded body is viewed in plan) is not particularly limited, and even if it is rectangular, it has a curve on at least a part of the outer periphery, such as a circle or an ellipse. Alternatively, it may be a polygonal shape other than a rectangle.
  • the maximum diameter of the bottom wall portion is preferably 200 mm or more, particularly preferably 500 mm or more.
  • the angle of the vertical wall rising from the periphery of the bottom wall (referring to the angle formed by the vertical wall and the bottom wall in the inner surface of the molded body) is not particularly limited, but is preferably 90 to 135 degrees.
  • the molded body of the present invention has a coating film 6 (see FIGS. 3 and 6) on the surface of the inner surface formed by the bottom wall and the vertical wall.
  • the “inner surface portion of the molded body” refers to a side surrounded by a bottom wall of the molded body and a vertical wall rising from the bottom wall at a predetermined angle.
  • the composition of the coating film is not particularly limited, and it is possible to exemplify paints; various types of node coating agents such as fluorine resin-based lacquers, silicone resin-based lacquers, and silane-based hard coating agents; artificial marble syrup; A paint is preferably used.
  • the thickness of the coating film is not particularly limited, but is usually 30 to 500 / ⁇ ⁇ , preferably 100 to 300 ⁇ m.
  • the molded body 4 of the present invention has at least one rib 423 extending in the outer direction of the bottom wall 42 ("the direction opposite to the direction in which the vertical wall 44 rises with respect to the bottom wall"; the same applies hereinafter).
  • Have These at least one rib is for imparting strength to the molded body, particularly the bottom wall portion thereof.
  • the number of ribs is not particularly limited, and can be appropriately determined in consideration of the size of the molded body in order to maintain the strength of the bottom wall portion of the molded body.
  • the “rib” usually refers to a plate-like member that is partially attached to the cross-section of the member in order to reinforce the thin-walled member. Also includes shapes, frustoconical shapes, prismatic shapes, truncated pyramid shapes, and the like.
  • ribs may be independent or may be partially or entirely continuous.
  • the width is preferably 2 to 20 mm, particularly preferably 5 to 15 mm! /.
  • the diameter of the circular cross-section is the top of the frustoconical surface (the side far from the bottom wall).
  • the height t3 of the rib 423 is not particularly limited, but is usually 5 to: LOOmm, preferably 10 to 50mm, more preferably 15 to 35m in a large-sized molded product such as a washing place bread and a washing machine bread. m.
  • the arrangement of the ribs 423 is not particularly limited, but usually the ribs are parallel to each other or form a lattice.
  • the spacing between the adjacent ribs 423 in parallel should be widened as long as the flatness or strength of the bottom wall of the molded product is maintained.For large molded products such as washing pans and washing machine pans, etc. 100 mm or more, preferably 150 mm or more.
  • the bottom wall 42 has a rib and a boss (not shown) in addition to or together with the plurality of ribs 423. It may be formed.
  • At least one of the at least one rib 423 is formed as a vertical wall extension rib 424 on the vertical wall extension line (see FIGS. 3 and 6).
  • the vertical wall extension rib 424 has an effect of maintaining the strength of the vertical wall portion. Note that “on the extended line” means that it is continuous with the vertical wall, and does not necessarily need to be on a straight line.
  • the vertical wall extension rib 424 may be formed on a part of the vertical wall extension, which may be formed over the entire vertical wall extension.
  • At least one additional rib 425 (see Fig. 3) extending in the outward direction of the bottom wall is formed from the vertical wall extension rib 424. Formed at a position within 50mm toward the center of the outer surface of the bottom wall! The distance L1 between the rib 424 and the rib 425 is the shortest distance between the respective cross sections when each rib is virtually cut at the outer surface of the bottom wall of the molded body.
  • the height t5 ′ of the additional rib 425 is not particularly limited, but is preferably the same as the height t3 ′ of the rib 423.
  • the formation position of the additional rib 425 is preferably within 40 mm from the vertical wall extension rib 424 toward the center of the outer surface of the bottom wall of the molded body, and particularly preferably within 30 mm.
  • the additional rib 425 In the molded body of the present invention, by forming the additional rib 425, a uniform coating film free from coating defects is formed. In other words, the force that causes contraction in the horizontal direction (in the direction parallel to the bottom wall of the molded body) during molding. This additional rib 425 is locked by the corresponding female mold cavity 285 (see FIG. 1). In particular, shrinkage of the bottom wall near the vertical wall of the molded body is suppressed. Therefore, the gap between the split surface side of the male mold and the inner surface of the molded body is maintained in the vertical wall portion of the molded body and the vicinity thereof, and the coating agent can be spread even if the molded body is large. A uniform and defect-free coating is formed that is not damaged.
  • the second molded body of the present invention instead of the additional rib 425 in the first molded body, on the bottom wall outer surface portion of the molded body, from the vertical wall extension rib 424 to the bottom wall outer surface of the molded body.
  • At least one depression 426 is formed at a position within 50 mm in the direction toward the center of the part (see Fig. 6). Note that the distance between the rib 424 and the depressed portion 426 is that the rib 424 is virtually formed. This is the shortest distance between the cross section when cut at the outer surface of the bottom wall and the outer edge of the depressed portion formed by the depressed portion 426 and the outer surface of the bottom wall of the molded body.
  • the shape of the depressed portion is not particularly limited, but can indicate a shape obtained by cutting a sphere (true sphere or ellipsoid) or a cuboid (cube or cuboid) by a plane.
  • the depth t6 ′ (see FIG. 6) is usually preferably 1 to 8 mm, and the maximum diameter of the outer edge of the depressed portion is 5 to 40 mm.
  • the position where the depression 426 is formed is a force that is required to be within 50 mm from the vertical wall extension rib 424 toward the center of the outer surface of the bottom wall of the molded body, preferably within 40 mm, Particularly preferably, it is within 30 mm.
  • the depressed portion 426 by forming the depressed portion 426, a uniform coating film having no coating defect is formed. That is, the horizontal shrinkage occurs during molding, but the depression 426 is locked by the corresponding female mold projection 286 (see FIG. 4), and in particular, the bottom wall near the vertical wall of the molded body. Shrinkage of the part is suppressed. Accordingly, the gap between the split surface side of the male mold and the inner surface of the molded body is maintained at and near the vertical wall of the molded body, and the spread of the coating agent is impaired even if the molded body is large. A uniform and defect-free coating is formed.
  • the molded body may have additional ribs 425 and depressions 426 formed at different locations, respectively.
  • the present invention has a bottom wall and a vertical wall that rises at a predetermined angle with at least a partial force at the outer edge of the bottom wall, and a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall
  • the outer surface vertical wall is near the intersection of the adjacent vertical walls.
  • a thick portion 448 is formed on the substrate. The thick part may be provided on the entire surface in the vicinity of the intersecting part or on a part thereof.
  • the shape of the thick part is not particularly limited, but a male die that corresponds to a trapezoidal column or part of a cylinder with a trapezoidal, circular or elliptical cross section in the height direction of the trapezoidal column or cylinder.
  • a shape cut out by two wall surfaces in the vicinity of the intersection of adjacent vertical walls can be exemplified.
  • the in-mold coating is applied after reaction injection molding.
  • the coating film is formed on the surface of the inner surface by forming the outer wall of the male mold 24 and the inner surface of the molded body 4 are in close contact with each other, the gap is reduced. In some cases, a band-like portion where a coating film is not formed is formed.
  • a thick wall portion 448 on the outer surface vertical wall at the intersection of the adjacent vertical walls a hollow 449 due to sink marks is formed at the inner surface of the adjacent vertical wall of the molded product during molding (see FIG. 8). Is formed.
  • the recess 449 prevents the vertical wall outer surface intersection of the male die 24 and the vertical wall inner surface intersection of the molded body 4 (so-called “hugging”), and acts as a liquid pool.
  • the coating agent spreads along the intersections of adjacent vertical walls, and a uniform coating film without coating defects is formed.
  • the thickness t8 ′ of the thick part 448 is preferably 1.3 to 1.8 times the thickness of the vertical wall.
  • a rib 289 (referred to as “vertical wall additional rib”) similar to the additional rib 425 provided on the outer surface of the bottom wall 42 of the molded body 4 is used as the outer surface of the vertical wall 44 of the molded body. (See Fig. 9).
  • the vertical wall additional rib is continuously provided up to the lower end of the upper end force of the vertical wall in the demolding direction of the vertical wall surface.
  • the shortest distance L2 between the thick portion and the vertical wall additional rib is preferably 50 mm or less, more preferably 40 mm or less. It is particularly preferred that it is less than 30 mm.
  • a depressed portion similar to the depressed portion 426 provided on the outer surface of the bottom wall portion of the molded body may be provided on the outer surface of the vertical wall portion of the molded body.
  • the uniformity of the coating film on the inner vertical wall portion of the molded body can be enhanced.
  • this protrusion is projected during molding to become a protrusion, and when the mold is removed, the female mold is divided. It is preferable to have a slidable structure so that it can move back to the surface.
  • Examples of the large molded article include a bathtub, a washing of a unit bath, a place pan, and a washing machine pan.
  • a drain outlet having a diameter of about 50 to 200 mm may be formed on the bottom wall of these molded bodies.
  • the mold of the present invention has a bottom wall and a vertical wall that rises at a predetermined angle from at least a part of an outer edge of the bottom wall, and an inner surface portion formed by the bottom wall and the vertical wall. This is for producing a molded body having a coating film on the surface by reaction injection molding.
  • the mold of the present invention is particularly suitable for producing a large-sized molded body having a coating film on the surface of the inner surface portion.
  • the mold according to the present invention has a bottom wall and a vertical wall that rises at a predetermined angle with at least a partial force of an outer edge of the bottom wall, and the surface of the inner surface formed by the bottom wall and the vertical wall
  • the male mold has a male mold and a female mold that can be divided in a vertical mold opening direction, and the male mold has an inlet for coating for forming a coating film.
  • the bottom wall is formed with a cavity for forming at least one rib extending in the outward direction of the molded body bottom wall, and at least one of these is formed by a male mold and a female mold.
  • the vertical wall extension rib forming cavity is on the extension line of the vertical wall forming cavity.
  • at least one cavity for forming the additional rib extending in the outer direction of the bottom wall of the molded body, and the vertical wall extension rib formation.
  • the cavitica for use is also formed at a position within 50 mm in the direction toward the center of the bottom wall forming part of the female mold.
  • This mold is a mold for molding the first molded body of the present invention (hereinafter, simply referred to as “first mold”).
  • another mold according to the present invention has a bottom wall and a vertical wall rising at a predetermined angle from at least a part of an outer edge of the bottom wall, and an inner surface formed by the bottom wall and the vertical wall.
  • a mold for producing a molded body having a coating film on the surface of a part by reaction injection molding and in-mold coating, and for dividing the mold to form a cavity inside the mold by clamping the mold on the divided surface The male mold has a male mold and a female mold that can be divided in a direction perpendicular to the mold opening direction.
  • the male mold has a coating film forming coating agent inlet, and the female mold has a dividing surface side.
  • the bottom wall of the mold is formed with a cavity for forming at least one rib extending in the outward direction of the molded body bottom wall, and at least one of the molds is formed by a male mold and a female mold.
  • Body Vertical wall extension rib forming key on the extension line of the vertical wall forming cavity Is formed as Viti, further, even on the surface of the female mold split surface side wire carrier for the compact vertical wall formed Vitika is also characterized by having at least one protrusion that faces in the direction of the male mold at a position within 50 mm in the direction toward the center of the bottom wall forming part of the female mold.
  • This mold is a mold for molding the second molded body of the present invention (hereinafter, simply referred to as “second mold”).
  • a mold 20 according to an embodiment of the first mold of the present invention shown in FIG. 1 has a male mold 24 and a female mold 26 that can be divided in the mold opening direction X perpendicular to the dividing surface 22. Then, by clamping the male mold 24 and the female mold 26 with the dividing surface 22, the cavity 28 is formed inside the mold.
  • the cavity 28 includes a first cavity 281, a second cavity 282, a third cavity 283 (including the fourth cavity 284 as a part thereof) and a fifth cavity 285.
  • the first cavity 281 is a gap for forming the bottom wall 42 of the molded body 4, and the second cavity 282, the third cavity 283, the fourth cavity 284, and the fifth cavity Connected to Cavity 285.
  • the third cavity to the fifth cavity are formed on the bottom wall portion of the female mold on the dividing surface side toward the outer side of the molded body bottom wall.
  • the width tl of the first cavity 281 is determined in consideration of the thickness tl ′ of the bottom wall 42 of the molded body 4.
  • the width tl is preferably 5 to 15 mm.
  • the second cavity 282 is a gap for forming the vertical wall 44 rising from the bottom wall 42.
  • the width t2 of the second cavity 282 is determined in consideration of the thickness t2 ′ of the vertical wall 44 of the molded body 4 described above.
  • the width t2 is preferably 5 to 20 mm, particularly preferably 5 to 15 mm.
  • the width t2 of the second cavity 282 is set in consideration of the occurrence of molding shrinkage (thickness direction) on the vertical wall 44 of the molded body 4.
  • the molding shrinkage is small in the horizontal direction parallel to the bottom wall of the compact, which is large in the vertical direction of the compact.
  • the inner surface of the vertical wall of the molded body which is formed by contraction in the thickness direction that is the horizontal direction of the vertical wall, faces this.
  • the gap between the outer surface of the male mold vertical wall portion tends to be small, and the coating agent is circulated.
  • the molding shrinkage in the thickness direction of this portion can be increased, as shown in FIG.
  • the gap 60 between the vertical wall 44 inner surface intersection of the molded body 4 after curing and the vertical wall outer surface intersection of the male mold 24 can be secured.
  • the coating film 6 can be reliably formed on the inner surface of the vertical wall 44.
  • the third cavity 283 is a gap for forming the rib 423.
  • the third cavity 283 includes a gap for forming the boss portion in addition to or together with the rib 423 when a boss portion (not shown) is formed.
  • the third cavity 283 for forming the rib 423 of the molded body is formed on the bottom wall portion on the dividing surface side of the female mold.
  • the third cavity 283 may be composed of a plurality of independent cavities, or may be a partially or wholly continuous cavity.
  • the depth t3 of the third cavity 283 is usually 5 to: LOOmm, preferably 10 to 50mm, more preferably 15 to 35mm.
  • the diameter of the circular cross section is 4 to 39 mm, preferably 6 to 34 mm, more preferably 8 to 29 mm on the top surface of the truncated cone (the side far from the bottom wall of the molded body). It is 5 to 40 mm, preferably 7 to 35 mm, and more preferably 9 to 30 mm on the bottom surface (side closer to the molded product bottom wall).
  • a short piece with a square cross section is 4 to 39 mm, preferably 6 to 34 mm, more preferably 8 to 29 mm on the top surface of the truncated cone (the side far from the bottom wall of the molded body). It is 5 to 40 mm, preferably 7 to 35 mm, more preferably 9 to 30 mm on the lower surface (side closer to the molded product bottom wall).
  • the arrangement of the third cavity 283 is not particularly limited, but usually the cavity is parallel to each other. Or a grid is formed. It is desirable to increase the spacing between the third cavity 283 adjacent to each other as long as the flatness or strength of the bottom wall of the molded product is maintained. In this case, it is 100 mm or more, preferably 150 mm or more.
  • the third cavity 283 preferably has a draft angle in consideration of ease of demolding.
  • the draft is preferably 1 to 10 degrees, more preferably 3 to 7 degrees.
  • At least one of the third cavities 283 is referred to as a second cavity 282 (hereinafter, referred to as "cavity for forming a vertical wall extension rib"). It is formed on the extended line of the molding vertical wall portion forming cavity). Note that “on the extended line” means that it is continuous with the vertical wall, and does not necessarily need to be on a straight line.
  • the vertical wall extension rib forming cavity 284 may be formed on a part of the vertical wall extension, which may be formed over the entire vertical wall extension.
  • a recess 429 due to shrinkage is formed at the intersection of the bottom wall 42 and the vertical wall 44 on the inner surface of the molded body (see FIG. 3).
  • This dent 429 prevents the corner portion of the bottom wall on the male mold dividing surface side and the corner portion of the inner surface of the molded body from coming into close contact, and when the coating agent flows along the vertical wall from the bottom wall of the molded body, It becomes a pool and helps the coating flow.
  • the first mold according to the present invention has a fifth cavity 285 for forming the additional rib 425 of the first molded body.
  • the fifth cavity 285 is formed so that the distance between the two cavities is 50 mm or less by urging from the longitudinal wall extending rib forming cavity 284 toward the center of the bottom wall forming portion of the female mold.
  • the distance between the two cavities is preferably 40 mm or less, particularly preferably 30 mm or less.
  • the distance between the cavities means the shortest distance between the cavities on the dividing plane when both cavities are viewed from the direction perpendicular to the dividing plane of the male mold and the female mold.
  • the shape of the fifth cavity 285 is not particularly limited, but is a plate, a column, a truncated cone, a square, A frustum shape, a prismatic shape, a truncated pyramid shape and the like are mentioned, and a plate shape is preferable.
  • the fifth cavity 285 may be composed of a plurality of independent cavities, or may be a partially or wholly continuous cavity.
  • the depth t5 of the fifth cavity 285 is usually 5 to: LOOmm, preferably 10 to 50mm, more preferably 15 to 35mm.
  • the diameter of the circular section is 4 to 39 mm, preferably 6 to 34 mm, more preferably 8 to 29 mm on the top surface of the truncated cone (the side far from the bottom wall of the molded body). It is 5 to 40 mm, preferably 7 to 35 mm, and more preferably 9 to 30 mm on the bottom surface (side closer to the molded product bottom wall).
  • a short piece with a square cross section is 4 to 39 mm, preferably 6 to 34 mm, more preferably 8 to 29 mm on the top surface of the truncated cone (the side far from the bottom wall of the molded body). It is 5 to 40 mm, preferably 7 to 35 mm, more preferably 9 to 30 mm on the lower surface (side closer to the molded product bottom wall).
  • the fifth cavity 285 preferably has a draft angle in consideration of ease of demolding.
  • the draft is preferably 1 to 10 degrees, more preferably 3 to 7 degrees.
  • the coating film in the portion adjacent to the vertical wall portion of the bottom wall portion of the molded body can be made uniform with no coating defects.
  • the fifth cavity 285 locks the rib 425 corresponding thereto, so that shrinkage of the bottom wall portion in the vicinity of the vertical wall portion of the molded body is particularly suppressed. Therefore, the gap between the split surface side of the male mold and the inner surface of the molded body is maintained at and near the vertical wall of the molded body, and even if the molded body is large, spread of the coating agent is impaired. A uniform and defect-free coating film is formed.
  • the second mold of the present invention instead of the fifth cavity 285 in the first mold of the present invention described above, on the surface of the female mold on the dividing surface side, at least 50 mm, preferably 40 mm, particularly preferably 30 mm, at least in the direction of the male mold. It has one protrusion 286 (see FIG. 5).
  • This protrusion is for forming the depression 426.
  • the shape of the protrusion is not particularly limited, and can be a shape obtained by cutting a sphere or a cuboid with a plane.
  • the height t6 is preferably 1 to 8 mm, and the maximum diameter of the cross section when the protrusion is virtually cut at the outer surface of the bottom wall of the molded body is preferably 5 to 40 mm.
  • the coating film in the portion of the bottom wall portion adjacent to the vertical wall portion of the molded body can be made uniform without any coating defects.
  • the protrusion 286 locks the corresponding depressed portion 426 of the molded body 4, thereby suppressing the shrinkage of the bottom wall portion particularly near the vertical wall portion of the molded body. Is done. Therefore, the gap between the split surface side of the male mold and the inner surface of the molded body is maintained at and near the vertical wall of the molded body, and the spread of the coating agent is impaired even if the molded body is large. A uniform and defect-free coating film is formed.
  • the present invention has a bottom wall and a vertical wall that rises at a predetermined angle with at least a partial force at the outer edge of the bottom wall, and a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall
  • the depressed portion has substantially the same height as the vertical wall portion.
  • the shape of the depressed portion is not particularly limited, but a part of a trapezoidal column or cylinder having a trapezoidal shape, a circular shape, an elliptical shape, or the like is adjacent to the corresponding male mold in the height direction of the trapezoidal column or the cylindrical shape.
  • a shape cut by two wall surfaces in the vicinity of the intersection of the matching vertical walls can be exemplified.
  • the depth t8 (distance from adjacent vertical wall intersections of the male mold) is 1.3 to 3 times the thickness of the vertical wall.
  • a depression 449 due to sink marks is formed on the inner surface of the intersection of the adjacent vertical walls of the molded body at the time of molding. (See Figure 7 and Figure 8).
  • This recess 449 prevents the corners of the male mold 24 from adhering to the molded body 4 (so-called “hugging”), and acts as a liquid pool. As a result, at the intersection of the adjacent vertical walls. The coating spreads along the surface, and a uniform coating film without coating defects is formed.
  • the mold of the present invention has a coating agent inlet.
  • the attachment position of the coating agent inlet is appropriately determined in consideration of the mold structure and the flow of the coating agent.
  • the number of coating agent injection ports may be one, but since the flow rate of the coating agent is generally inversely proportional to the distance of the coating agent injection locus, multiple, usually 2 to 4, preferably 2 to 3 If the injection port is provided, the coating agent can be injected more effectively.
  • the distance between two adjacent coating material inlets is usually 0.5 to 3 m, preferably 0.8 to 2 m. If there are multiple inlets, bubbles may form at the confluence of the coating agent injected into each injection loca, so adjust appropriately with the injection pressure of the coating agent.
  • the male mold has a coating inlet 34.
  • a coating material injection device 32 is attached to the coating material injection port.
  • the inner diameter of the coating agent inlet 34 may be, for example, about 10 to 15 mm in diameter. When a plurality of coating agent inlets 34 are provided, the inner diameter may be different for each inlet.
  • the coating agent is injected from the coating agent inlet 34 into the gap 60 (see FIGS. 3 and 6) between the molded body and the outer wall of the male mold.
  • an injection port for injecting the reaction stock solution is formed in a part of the dividing surface 22, and there is a mixer 30 (for injecting the reaction stock solution for producing a molded product). (Not shown).
  • burrs are formed at locations corresponding to the end, the runner, and the opening of the molded body to form the molded body.
  • the coating with the coating agent is carried out completely to the end of the molded body.
  • the tip of the guide is preferably sealed with a weir.
  • the thickness of the burr formed by this guide is preferably 0.01 to 2 mm, particularly preferably 0.1 to 1 mm.
  • the width of the groove is 2 to: LOOmm is preferred, and 10 to 50 mm is particularly preferred!
  • the height of the projections of the molded article formed by this is preferably 0.1 mm or more and 20 mm or less, more preferably 1 mm or more and 15 mm or less, more preferably 2 mm or more and 10 mm or less.
  • the shape of the strong protrusion is preferably smaller in the top width than the bottom width in view of easy removal.
  • This mold fixing means has a locking structure in which a pin can protrude and retract on the dividing surface side of the female mold.
  • a core-sheath structure having a slide mechanism is used.
  • the slide mechanism is not particularly limited, and is, for example, a mechanism that reciprocates from outside the mold by a force such as electricity, steam pressure, water pressure, and hydraulic pressure.
  • this core is preferably protruded by 1 to 50 mm, more preferably 5 to 12 mm to prevent the molded body from swinging, and the core is retracted during subsequent demolding. Is 0-20 mm, more preferably 0-: LOmm is depressed.
  • a plurality of mold fixing means should be installed around the molding in the horizontal direction of the side of the molding. Can do. What is necessary is just to determine the number and space
  • the material of the mold is not particularly limited, and specific examples thereof include steel, forged or forged aluminum, forged or thermally sprayed zinc alloy or the like, nickel or copper for example, nickel, copper, Examples include chrome and the like, or rosin.
  • the mold structure should be determined in consideration of the pressure when the mixed solution and coating agent are injected into the mold.
  • the mold clamping pressure is 0.1 to 9.8 MPa in gauge pressure.
  • the bottom wall of the present invention and at least a partial force of the outer edge of the bottom wall are vertical walls that rise at a predetermined angle, and a coating film is formed on the surface of the inner surface formed by the bottom wall and the vertical walls.
  • a method for producing a molded body includes: reacting a reaction stock solution for producing a molded body in a lump polymerization in the above-described mold, and at least a partial force between a bottom wall parallel to the mold opening surface and an outer edge of the bottom wall at a predetermined angle.
  • the male mold 24 is combined with the female mold 26 and the dividing surface 22, and a cavity 28 is formed between the male mold 24 and the female mold 26.
  • the reaction stock solution is supplied to cause bulk polymerization.
  • the temperature of the reaction stock solution before supply is preferably 10 to 60 ° C, and the viscosity of the reaction stock solution is, for example, if30 ° C [Cool! Normally, 5 to 3, OOOcP, preferably ⁇ or 50 to : About L, OOOcP.
  • the reaction stock solution used in the present invention contains a polymerizable monomer and a polymerization catalyst as essential components, and optionally contains an activator (co-catalyst).
  • polymerizable monomer cyclic olefin is preferred, and a norbornene monomer is particularly preferred.
  • polymerization catalyst a metathesis (ring-opening) polymerization catalyst is preferable.
  • the norbornene-based monomer include those having a norbornene ring.
  • Specific examples thereof include bicyclic compounds such as norbornene and norbornagen, tricyclic compounds such as dicyclopentagen and dihydridocyclopentagen, and tetracyclododecene. And the like, pentacycles such as cyclopentadiene trimer, and heptacycles such as cyclopentagen tetramer.
  • These bicyclic to heptacyclic compounds have hydrocarbon groups such as alkyl groups, alkyl groups, alkylidene groups, and aryl groups, and polar groups such as ester groups, ether groups, cyan groups, and halogen atoms as substituents.
  • a tricyclic or higher polycyclic norbornene monomer is more preferable because it is easily available and has excellent reactivity, and a tricyclic to pentacyclic norbornene monomer is more preferable.
  • norbornene-based monomer examples include dicyclopentagen, tricyclopentagen, cyclopentagen-methylcyclopentagen co-dimer, 5-ethylidene norbornolene, nonolebonolene, nonolebonenogen, 5-cyclohexane Hexe-Nolenono Lebonorenene, 1, 4, 5, 8—Dimethanone 1, 4, 4a, 5, 6, 7, 8, 8a—Year-old Kutahydronaphthalene, 1,4-methano —1, 4, 4a, 5, 6, 7, 8, 8a—octahydronaphthalene, 6-ethylidene—1, 4, 5, 8—dimethano—1, 4, 4a, 5, 6, 7, 8, 8a—octahydronaphthalene, 6—Ethylidene— 1, 4 Metanol 1, 4, 4a, 5, 6, 7, 8, 8a—Talented Kutahydronaphthalene, 1, 4, 5, 8—Dimethano 1, 4, 4a, 5, 6, 7
  • Norbornene monomers may be used alone or in combination of two or more.
  • monocyclic cycloolefins such as cyclobutene, cyclopentene, cyclopentagene, cyclootaten, and cyclododecene can be used as a comonomer.
  • the polymerization catalyst is preferably a metathesis polymerization catalyst.
  • the metathesis polymerization catalyst is not particularly limited as long as it is a catalyst capable of ring-opening polymerization of a norbornene-based monomer.
  • the metathesis polymerization catalyst is a complex formed by bonding a plurality of ions, atoms, polyatomic ions and z or a compound with a transition metal atom as a central atom.
  • transition metal atoms atoms of Groups 5, 6 and 8 (long-period periodic table, the same shall apply hereinafter) are used.
  • the atoms of each group are not particularly limited. Examples of the Group 5 atom include tantalum. Examples of the Group 6 atom include molybdenum and tungsten. Examples of the Group 8 atom include ruthenium. And osmium.
  • a metathesis polymerization catalyst having group 6 tungsten or molybdenum as a central metal Metal halides such as salt and tungsten; metal oxyhalides such as tungsten chlorate; metal acids such as acid and tungsten; and tridodecyl ammonium molybdate and tri (tridecyl) ammonium Organometallic acid ammonium salts such as hummolybdate can be used.
  • Metal halides such as salt and tungsten
  • metal oxyhalides such as tungsten chlorate
  • metal acids such as acid and tungsten
  • Organometallic acid ammonium salts such as hummolybdate
  • organic molybdate ammonium salts are preferable.
  • organic aluminum compound or an organic tin compound as an activator (cocatalyst) for the purpose of controlling the polymerization activity.
  • a metal carbene complex having a metal atom of Groups 5, 6 and 8 as a central metal is also preferable to use.
  • group 8 ruthenium and osmium carbene complexes are preferred, and ruthenium carbene complexes are particularly preferred. Because the catalyst activity during bulk polymerization is excellent, the productivity of norbornene-based resin molded products is excellent, and the productivity of the resulting norbornene-based resin molded products is low in odor derived from unreacted norbornene-based monomers. Because it is excellent.
  • the ruthenium carbene complex at least two carbene carbons are bonded to a ruthenium metal atom, and at least one of the carbene carbons is bonded to a group containing a heteroatom to form a ruthenium carbene carbon.
  • the amount of the metathesis polymerization catalyst used is usually 0.
  • activator are not particularly limited, and examples thereof include organometallic compounds of metals in Groups 11 to 14 of the periodic table. Specific examples thereof include organic aluminum compounds such as alkylaluminum halides such as ethylaluminum dichloride and jetylaluminum chloride, and alkoxyalkylaluminum halides; organic tin compounds such as tetrabutyltin; and the like. When a ruthenium carbene complex is used as a metathesis polymerization catalyst, an activator may or may not be used.
  • the amount of the activator to be used is not particularly limited, but is usually 0.1 mol or more, preferably 1 mol or more and 100 mol or less with respect to 1 mol of the metathesis polymerization catalyst used for the reaction. Or less than 10 moles. If the activator is not used, or if the amount of the activator used is too small, the polymerization activity is too low and the reaction takes time, resulting in poor production efficiency. Conversely, if the amount used is too large, the reaction is so intense that it may harden before it is fully filled in the mold.
  • the activator is used after being dissolved in the monomer, but within a range that does not substantially impair the properties of the molded article by the reaction injection molding method, it is suspended in a small amount of solvent and mixed with the monomer. It may be used by precipitating or improving solubility.
  • an activity regulator as a component of the reaction stock solution.
  • the activity regulator is for preventing the polymerization from starting during the injection when the polymerization catalyst monomer solution B and the activator monomer solution B are mixed and injected into the mold.
  • Lewis base is suitable, and ether, ester, nitrile and the like are used. Specific examples include butyl ether, ethyl benzoate, diglyme and the like.
  • a polar group-containing monomer is used as a copolymerization monomer, the monomer itself may be a Lewis base, and may also function as a regulator.
  • the modifier is preferably added to Solution B containing the active ingredient.
  • additives are added to the reaction stock solution within a range that does not impair the adhesiveness, adhesion, etc. between the cured coating and the molded product. You may mix. Possible additives include reinforcing materials, antioxidants, heat stabilizers, light stabilizers, UV absorbers, fillers, pigments, colorants, foaming agents, antistatic agents, flame retardants, lubricants, softeners. , Tackifiers, plasticizers, mold release agents, deodorants, fragrances, elastomers, dicyclopentagen-based heat-polymerized resins and hydrogenated products thereof.
  • additives are used by adding them to the catalyst or activator monomer solution; separately prepared as a monomer solution and mixed with the catalyst or activator monomer solution during reaction injection molding; It is added by the method of filling in The addition method may be appropriately selected depending on the type of additive.
  • the male mold 24 It is preferable to set the mold temperature Tl (° C) higher than the mold temperature T2 (° C) of the female mold 26 (T1> T2).
  • Tl the mold temperature higher than the mold temperature T2 (° C) of the female mold 26
  • T1> T2 the mold temperature of the female mold 26
  • T1 ⁇ 2 is preferably 5 ° C or higher, more preferably 10 ° C or higher, and the upper limit is preferably 60 ° C or lower.
  • T1 is preferably 110 ° C or lower, more preferably 95 ° C or lower, and the lower limit is preferably 50 ° C or higher.
  • T2 is preferably 70 ° C or lower, more preferably 60 ° C or lower, and the lower limit is preferably 30 ° C or higher.
  • Examples of methods for adjusting the mold temperature include adjusting the mold temperature with a heater; adjusting the temperature of a heat medium such as temperature-controlled water or oil that is circulated in a pipe embedded inside the mold; and the like. It is done.
  • a coating agent is injected into the gap 60 from the coating agent inlet 34 shown in FIG.
  • the male mold 24 is slightly opened relative to the female mold 26, and the male mold 24 is sufficiently opened between the inner surface of the male mold 24 and the molded body 4.
  • the covering agent may be injected.
  • the coating agent is injected from the coating agent inlet 34 provided in the male mold 24.
  • the coating agent may be injected between the inner surface of the male mold 24 and the molded body 4 at a pressure higher than the mold clamping pressure while the male mold 24 and the female mold 26 are closed.
  • the gap 60 should be determined appropriately in consideration of the final coating thickness.
  • the composition of the coating agent is not particularly limited.
  • the composition includes, for example, an oligomer having at least two (meth) acrylate groups and Z or unsaturated polyester resin (vehicle component), and an ethylenically unsaturated monomer ( Monomer component), a polymerization initiator having a half-life temperature of 90 to 135 ° C for 1 minute, an accelerator for an organic peroxide polymerization initiator, and a release agent having a melting point of 125 ° C or lower. It is preferable to use an agent composition.
  • the polymerization initiator is an organic peroxide polymerization initiator. Is preferred.
  • Examples of the oligomer having at least two (meth) acrylate groups usable in the present invention include epoxy acrylate oligomer, urethane acrylate oligomer, polyester acrylate oligomer, polyether acrylate oligomer and the like. .
  • the epoxy acrylate oligomer is obtained by adding an epoxy compound and an unsaturated carboxylic acid to a normal epoxy group at a ratio of 0.5 to 1.5 carboxyl group equivalent per one epoxy group equivalent. Produced by an acid ring-opening addition reaction.
  • unsaturated carboxylic acid include acrylic acid and methacrylic acid.
  • the urethane acrylate oligomer can be obtained by mixing and reacting a diisocyanate compound, a diol compound and a hydroxyl group-containing (meth) acrylate.
  • the dioli compound and the diisocyanate compound can be reacted to form a urethane isocyanate intermediate containing one or more isocyanate groups per molecule, and then the intermediate
  • the intermediate By reacting a product with a hydroxyl group-containing (meth) acrylate group, reacting a diisocyanate compound with a hydroxyl group-containing (meth) acrylate, and at least one isocyanate group per molecule
  • diisocyanate compound various known ones can be used. Specifically, tolylene diisocyanate, isophorone diisocyanate, polymethylene poly-diisocyanate, 1,2-diisocyanatoethane, hexamethylene diisocyanate, 1, 3— Mention may be made of organic diisocyanates such as bis (isocyanatomethyl) cyclohexane. These diisocyanate compounds may be used alone or as a mixture.
  • diol compound examples include ethylene glycol, propylene glycol, polyethylene glycol, polyethylene glycol, polypropylene glycol diol and the like, and diester diol which is a diester reaction product of dicarboxylic acid or its anhydride. It is mentioned as a thing.
  • the polyester acrylate oligomer can be produced, for example, by a reaction between a polyester polyol having a hydroxyl group at the terminal and the aforementioned unsaturated carboxylic acid.
  • the polyether acrylate oligomer can be produced, for example, by reacting a polyether polyol such as polyethylene glycol or polypropylene glycol with the aforementioned unsaturated carboxylic acid.
  • the unsaturated polyester resin usable in the present invention is, for example, a condensation reaction between an unsaturated dibasic acid such as maleic acid fumaric acid and a polyhydric alcohol such as ethylene glycol, propylene glycol or trimethylolpropane. Can be manufactured by.
  • Examples of the ethylenically unsaturated monomer that can be used in the present invention include styrene, a-methylstyrene, chlorostyrene, butyltoluene, dibutenebenzene, methyl (meth) acrylate, 1, 6 hexanediol.
  • Typical examples include, but are not limited to, diatalylate, tripropylene glycol diathalate, trimethylolpropane tri (meth) acrylate, silicone acrylate, silicone dialate.
  • the amount of the ethylenically unsaturated monomer is appropriately 20 to 200 parts by weight, preferably 40 to 160 parts by weight per 100 parts by weight of the vehicle component, and has appropriate curing characteristics and viscosity within this range. A coating is obtained.
  • the organic peroxide polymerization initiator is used to polymerize the vehicle component and the monomer component.
  • Organic peroxide polymerization initiators preferably have a 1 minute half-life temperature of 90 ° C to 135 ° C.
  • Examples of such organic peroxides include bis (4 t-butylcyclohexane).
  • a cured product of a norbornene-based monomer is usually molded at a mold temperature of 65 to 95 ° C. Therefore, when the 1-minute half-life temperature of the organic peroxide polymerization initiator is higher than 135 ° C, the curing time of the coating agent becomes remarkably long, and in some cases, it does not cure at all. In addition, if the half-life temperature for 1 minute is lower than 90 ° C, the pot life of the coating agent is remarkably shortened, and there is a possibility that gelation may occur in the coating agent injection apparatus, which makes it impossible to inject the coating agent. Absent .
  • the organic peroxide polymerization initiator is added in an amount of 0.1 to 15 parts by weight, preferably 1 to 8 parts by weight per 100 parts by weight of the vehicle component.
  • Examples of the accelerator for the organic peroxide polymerization initiator include cobalt naphthenate, cobalt octylate, zinc naphthenate, zinc octylate, manganese naphthenate, lead naphthenate, or a mixture thereof. But are not limited to these.
  • An appropriate amount of the accelerator is 0.01 to 20 parts by weight, preferably 0.04 to LO parts by weight, per 100 parts by weight of the vehicle component.
  • a release agent having a melting point of 125 ° C or lower is preferably used.
  • Typical examples of such a releasing agent include stearic acid, hydroxystearic acid, zinc stearate, soybean oil lecithin, silicone oil, fatty acid ester, and fatty acid alcohol dibasic acid ester.
  • the molding temperature of norbornene monomers is usually 65 to 95 ° C, and even if the rise in the surface temperature of the cured product due to the reaction heat of norbornene monomers is taken into account
  • the mold release agent does not melt sufficiently and the original mold release effect is difficult to obtain.
  • the release agent may be liquid at normal temperature.
  • the compounding amount of the mold release agent is suitably 0.1 to 15 parts by weight, preferably 0.3 to 5 parts by weight with respect to 100 parts by weight of the vehicle component, and the release effect is exhibited within this range.
  • metal powder if necessary, metal powder, mold release agent other than the above, curing accelerator, polymerization inhibitor, ultraviolet absorber, light stabilizer, coloring pigment, extender pigment, conductivity Pigments, modified resin, surface conditioners, etc. can be blended.
  • mold release agents other than the above include fluorine compounds such as silicone oil and hexafluoropropene oligomer, and wax.
  • polymerization inhibitor examples include hydroquinone, benzoquinone, para-tert-butylcatechol and the like.
  • ultraviolet absorber and the light stabilizer examples include benzotriazole ultraviolet absorbers and triazine ultraviolet absorbers.
  • coloring pigment examples include titanium oxide, iron oxide, phthalocyanine blue, phthalocyanine green, and carbon black.
  • extender pigments examples include calcium carbonate, talc, silica, clay, my strength, barium sulfate, and aluminum hydroxide.
  • Examples of the conductive pigment include conductive carbon black and graphite.
  • the modified resin must have good compatibility with the vehicle component, and specific examples thereof include polymethylmetatalylate, polyacetate butyl, saturated polyester, chlorinated polyolefin and the like.
  • the viscosity of the coating is 500 to 100 mOmOp, measured with a B-type viscometer at 30 ° C (rotor # 2, 30 rpm) from the viewpoint of suppressing the wraparound of the coating and the generation of foam.
  • 600-7 OOOmPa-s force more preferred, 700-6, OOOmPa-s force ⁇ especially preferred! / ,.
  • the timing of injecting the coating agent from the coating agent injection port 34 is that the norbornene-based monomer or the like is injected into the cavity, and then a bulk polymerization reaction takes place inside the mold and the temperature of the molded product becomes the maximum temperature. From the time point, it is preferably within 5 seconds to 20 minutes, more preferably within 5 seconds to 10 minutes, and particularly preferably within 10 seconds to 5 minutes. If the timing of injecting the coating agent is too early, the reaction of the reaction solution of the molding material may be immature and may be deformed by the injection pressure of the coating agent. On the other hand, if the timing of injecting the coating agent is too late, the difference between the location where the shrinkage of the molded body increases and the location where it does not increase becomes significant, and the appearance of the coating film may be greatly reduced.
  • the mold temperature of the male mold 24 when pouring the coating agent into the gap 60 may be lower than the curing temperature of the coating agent, but after pouring the coating agent, it should be set above the curing temperature of the coating agent. Is preferred.
  • the injection pressure of the coating agent is not particularly limited, but is preferably 1 to 50 MPa, more preferably 3 to 30 MPa, and particularly preferably 5 to 22 MPa. If the pressure is too low, the coating material may not penetrate sufficiently, and conversely, if the injection pressure is too high, the equipment cost will be excessive and the cost will increase. It is necessary to make the mold structure pressure resistant, which may be inferior in economic efficiency.
  • the coating agent is cured by being held at a predetermined temperature for a predetermined time.
  • the curing temperature of the coating agent is preferably 70 to 110 ° C, more preferably 80 to 100 ° C, and the curing time is preferably 20 seconds to 6 minutes, more preferably 60 seconds to 4 minutes. If the curing temperature is too low, the coating agent and the surface of the molded article may not be sufficiently adhered, and the coating agent may be peeled off.On the other hand, if the coating temperature is too high, curing of the coating agent will begin while the coating agent is being injected, If it is impossible to inject the coating material to every corner, the injection pressure applied by force may become higher and the injector and mold may be damaged.
  • the coating may not be cured sufficiently and the coating may peel off.
  • productivity may be reduced.
  • the mold 4 is completely opened and removed to obtain the molded body 4 on which the coating film 6 is formed.
  • the size, shape, and the like of the molded body 4 are not particularly limited, and can be set to a desired size and shape.
  • the coating film 6 is formed only on the inner surface portion of the molded body 4, but the coating film 6 may be formed on both surfaces.
  • the coating film 6 may be formed on both surfaces.
  • the inner surface of the female mold 26 and the molded body 4 are cured.
  • a gap 60 may be formed between the two, and a coating agent may be put therein and cured.
  • the coating film 6 is not necessarily formed on the entire inner surface or outer surface of the molded body. Depending on the use of the molded body, the coating film 6 may be formed only on a part of the inner surface or the outer surface.
  • Upper edge force S 1,200mm, width 600mm, lower edge force length 1,190mm, width 590mm, height 150mm rectangular bottom wall part, vertical wall part rising from the whole circumference of the bottom wall part V, a forged aluminum female mold and an electrical male male mold were used to form the body.
  • a coating agent injection port 34 was provided at three locations, the central part and the apex of both longitudinal sides of the male die of the die, and an indicator with a maximum injection pressure of 40 MPa was attached to each coating agent injection port.
  • a cavity 284 (draft angle of 2 degrees) with a width of 10 mm, a length of 610 mm, and a depth of 20 mm was provided in the downward extension of the vertical wall of the female mold.
  • a cavity 285 having the same shape as the cavity 284 was provided at a position 25 mm from the cavity 284 toward the center in the longitudinal direction of the bonnet shaped body. Furthermore, a cavity 283 having the same shape as that described above was provided at intervals of 200 mm from the cavity 284. Next, the same shape of the above-mentioned cavity was provided at intervals of 200 mm in the direction perpendicular to the above-mentioned cavity to form a lattice.
  • two vertical wall-adding rib-forming cavities 289 horizontal cross-sectional shape is plate-like having a length of 160 mm and a maximum width of 30 mm were provided (see FIG. 9).
  • SUS fixing pins with sheaths with a diameter of 10 mm that slid around the outer peripheral side wall of the female mold and slidable substantially perpendicularly to the releasing direction were installed at 14 locations at intervals of about 200 mm.
  • the slide width is 3 mm high from the inner wall of the female mold in the “protruded” state and 12 mm deep in the “depressed” state.
  • burrs with a width of 30 mm and a thickness of 0.5 mm around the basin-shaped compact and the runner part are formed on the upper outer periphery of the female mold, and perpendicular to the male burrs.
  • the vertical part faces the molded body side.
  • a protrusion defect (about 10 mm long) was provided at one location of the male groove for air discharge.
  • solution A a solution mainly composed of dicyclopentagen having a polymerization catalyst component (trade name “Meton T02A solution” manufactured by RIMTEC), solution B: dicyclohexane having a catalyst active component A solution containing pentagen as a main component [manufactured by RIMTEC, trade name “Meton T02B solution”] was used.
  • urethane acrylate oligomer Paint (Dainippon Paint Co., Ltd., trade name “Praglas # 400”) with 100 parts of dibutyl phthalate and bis (4-tert-butylcyclohexyl) peroxydicarbonate (chemical)
  • the male mold and the female mold are clamped, the 14 fixing pins are set in the “projection” state, and the female mold and the male mold are heated to 40 ° C. and 90 ° C., respectively.
  • the mold was clamped at a pressure of 1, and using a reaction injection molding machine, equal weight solutions A and B were collided and mixed in a mixing head, and the resulting reaction stock solution was injected into the mold. After filling the reaction stock solution, hold at the mold temperature for about 1 minute, and after the molded body temperature reaches the maximum temperature, inject 200 mL of coating agent into the mold at a pressure of 20 MPa and hold at the mold temperature for 3 minutes. did.
  • the 14 fixing pins were set in the “retracted” state, the mold was opened, and the bonnet-shaped body having the coating film was taken out.
  • the coating state of the coating film was 100-300 m thick with no defects on the entire inner surface, and was covered with all parts.
  • a basin-shaped product was obtained in the same manner as in Example 1 except that a mold having no cavity 285 was used.
  • a mold having no cavity 285 was used.

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  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

Pièce moulée dotée d'un revêtement uniforme exempt de défauts de revêtement, obtenue par moulage par injection et réaction dans un moule associé à un revêtement de moule. L'invention concerne également le moule et le procédé de moulage. La pièce moulée présente une paroi de fond et une paroi verticale se dressant selon un angle prédéterminé à partir d'au moins une partie du bord extérieur de la paroi de fond. Un film de revêtement est mis en place sur la surface d'une partie de surface intérieure formée de la paroi de fond et de la paroi verticale, au moins une nervure s'étend dans la direction extérieure de la paroi de fond, et au moins une des nervures est formée comme une nervure de prolongement de la paroi verticale sur la ligne de prolongement de la paroi verticale. De plus, au moins une autre nervure, autre(s) que la ou les nervures s'étendant dans la direction extérieure de la paroi de fond, ou un renfoncement, est formé(e) à une position située à moins de 50 mm de la nervure de prolongement de la paroi verticale dans la direction centrale de la partie de surface extérieure de la paroi de fond de la pièce moulée.
PCT/JP2007/051134 2006-01-27 2007-01-25 Piece moulee, son moule et procede de moulage utilisant ledit moule WO2007086444A1 (fr)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014142062A1 (fr) * 2013-03-13 2014-09-18 株式会社小糸製作所 Produit bicolore moulé
JP2017030262A (ja) * 2015-08-03 2017-02-09 株式会社小糸製作所 射出成形方法および金型
US9803046B2 (en) 2013-03-15 2017-10-31 Materia, Inc. In-mold coating of ROMP polymers

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