JPWO2007086444A1 - MOLDED BODY, MOLD FOR THE SAME, AND METHOD FOR PRODUCING MOLDED BODY USING THIS MOLD - Google Patents

Abstract

Provided are a molded article having a uniform coating film free from application defects by reaction injection molding and in-mold coating in a mold, and a mold and a molding method therefor. The molded body has a bottom wall and a vertical wall that rises at a predetermined angle from at least a part of the outer edge of the bottom wall, and has a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall. At least one rib extending in the outer direction of the bottom wall, and at least one of the ribs is formed as a vertical wall extension rib on the vertical wall extension line, and in addition to the at least one rib, the bottom wall At least one additional rib extending in the outer side direction or a depressed portion is formed 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.

Description

  The present invention relates to a molded body, a mold for manufacturing the molded body, and a method for manufacturing a 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.

Large molded products used for automobile parts such as bumpers and air deflectors, construction and industrial machines such as wheel loaders and power shovels, leisure equipment such as golf cars and game machines, and housing equipment such as wash bowls and unit baths, Recently, it is manufactured by reaction injection molding. In order to impart characteristics such as designability and weather resistance to the resin molded body used in each of these uses, a coating film is formed.
For the formation of this coating film, a method of spray coating the surface of a resin molded body obtained by bulk polymerization of a reaction stock solution composed of a monomer, a catalyst, etc. in a mold by a reaction injection molding method (RIM method). Has been adopted.

However, the resin molded body in which the coating film is formed by this method has a problem in that the adhesiveness of the coating film is lowered due to a change with time and the production cost is high.
As a method for solving this problem, an in-mold coating method is known. When a molded body is manufactured by the reaction injection molding method, the volume shrinks when the reaction stock solution becomes a molded body. Although this is called molding shrinkage, a gap of 5 to 500 μm is usually generated between the mold and the molded body due to the molding shrinkage. The in-mold coating method is a method in which a coating agent is injected into a gap between a molded body and a mold surface generated by the molding shrinkage 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.

The present applicant applied this in-mold coating method to a basin-shaped body such as a washing bath pan of a unit bath. As a result, it is difficult for the coating agent to enter the vertical wall portion of the basin-shaped body. Noticed that a good coating could not be formed.
As a result of investigations to solve this problem, the timing from the end of bulk polymerization of the reaction stock solution used for reaction injection molding to the start of coating injection, the thickness of the vertical wall, the formation position of the ribs, etc. are specified ranges, respectively. As a result, it was ascertained that coating defects of the coating agent and generation of wrinkles and cracks could be prevented, and a patent application was filed for this technique (Patent Document 1).
However, as a result of further research, it has been found that when the molded body becomes large, it may not be possible to completely prevent the coating failure of the coating agent and the generation of wrinkles and cracks even by this method.

JP 2003-11152 A

  Accordingly, 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 and wrinkles and cracks even in 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. To provide molds. Furthermore, another object of the present invention is to provide a molding method using this mold to obtain a molded body having a uniform coating film having no coating defects even if it is a large molded body.

  As a result of earnest research on the molding method of the molded body in order to achieve the above-mentioned object, the present inventors have found that molding shrinkage during reaction injection molding is not only in the vertical direction but also in the horizontal direction (the direction parallel to the bottom wall of the molded body). However, this horizontal mold shrinkage causes a clogged portion in the gap between the vertical wall portion of the molded body and the surface of the vertical wall portion of the mold, and this impedes the flow of the coating material. Based on this finding, we found that coating defects occurred, and that uniform coating films were not formed due to the formation of wrinkles and cracks, and this phenomenon was particularly noticeable in the case of large molded products. Further research has been made to complete the present invention.

Thus, according to the present invention,
(1) A molded body having a bottom wall and a vertical wall rising at a predetermined angle from at least a part of the outer edge of the bottom wall, and having a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall And having at least one rib extending in the outer direction of the bottom wall, at least one of which is formed as a vertical wall extension rib on the vertical wall extension line, and other than the at least one rib Further, at least one additional rib extending in the outer direction of the bottom wall is formed 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. body,
(2) The molded body according to (1), wherein at least one additional rib is formed at a position within 40 mm from the vertical wall extension rib toward the center of the outer surface of the bottom wall of the molded body.

(3) 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 coating film on a surface of an inner surface portion formed by the bottom wall and the vertical wall. And at least one rib extending in the outward direction of the bottom wall, at least one of which is formed as a vertical wall extension rib on the vertical wall extension line, and further, the outer surface of the bottom wall of the molded body The molded body, wherein at least one depression is formed 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,
(4) 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 vertical wall extension rib toward the center of the outer surface of the bottom wall of the molded body (3 ),

(5) 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 product according to any one of the above,
(6) The molded body according to (5), wherein the thickness of the thick part is 1.3 to 1.8 times the thickness of the vertical wall,
(7) The molded body according to any one of (1) to (6), wherein the maximum diameter of the bottom wall portion of the molded body is 200 mm or more,

(8) 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 coating film on a surface of an inner surface portion formed by the bottom wall and the vertical wall. Die for reaction injection molding and in-mold coating, and can be divided in the mold opening direction perpendicular to the dividing surface to form a cavity inside the mold by clamping on the dividing surface A male mold and a female mold, the male mold has an inlet for coating for forming a coating film, and the bottom wall on the dividing surface side of the female mold has a bottom wall of the molded body A cavity for forming at least one rib extending in the outward direction of the molded body is formed, and at least one of the cavities is an extension of a cavity for forming a vertical wall portion of a molded body formed of a male mold and a female mold Is formed as a rib for forming a vertical wall extension rib, and In addition to the cavity for forming the at least one rib, at least one cavity for forming the additional rib extending in the outward direction of the bottom wall of the molded body is provided from the cavity for forming the vertical wall extension rib to the bottom of the female mold. A mold characterized by being formed at a position within 50 mm toward the center of the wall forming portion;

(9) A molded body having a bottom wall and a vertical wall rising at a predetermined angle from at least a part of the outer edge of the bottom wall, and having a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall Die for reaction injection molding and in-mold coating, and can be divided in the mold opening direction perpendicular to the dividing surface to form a cavity inside the mold by clamping on the dividing surface A male mold and a female mold, the male mold has an inlet for coating for forming a coating film, and the bottom wall on the dividing surface side of the female mold has a bottom wall of the molded body A cavity for forming at least one rib extending in the outward direction of the molded body is formed, and at least one of the cavities is an extension of a cavity for forming a vertical wall portion of a molded body formed of a male mold and a female mold Is formed as a rib for forming a vertical wall extension rib, and On the surface of the female mold on the dividing surface side, at least one heading in the male mold direction at a position within 50 mm from the molded body vertical wall forming cavity toward the center of the bottom wall forming section of the female mold. A mold characterized by having two protrusions,

(10) A mold for producing 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 vertical walls of the molded body The mold according to (8) or (9), wherein the female mold part corresponding to the outer surface crossing part has a depressed part,
(11) The mold according to any one of (8) to (10), wherein the maximum diameter of the bottom wall portion of the molded body is 200 mm or more,

(12) The reaction stock solution is bulk polymerized in the above mold to form a molded body having a bottom wall parallel to the mold opening surface and a vertical wall rising at a predetermined angle from at least a part of the outer edge of the bottom wall. And during the molding of the molded body in the mold, after the temperature of the molded body reaches the maximum temperature, the injection of the coating agent is started, and the split surface side of the male mold and the bottom wall of the molded body The bottom wall and the outer edge of the bottom wall comprising the step of forming the coating film on the surface of the inner surface portion of the molded body by allowing the coating agent to enter and cure in the gap between the inner surface portion formed by the vertical wall There is provided a method of manufacturing a molded body having a vertical wall rising at a predetermined angle from at least a part of the inner wall and having a coating film on a surface of an inner surface formed by the bottom wall and the vertical wall.

According to the present invention, it is possible to obtain a molded body having a uniform coating film having no coating defects even if it is a large reaction injection molded body.
Since this molded body has a uniform coating film, no coating defects, and is excellent in design, it can be suitably used for automotive parts, construction / industrial machines, leisure equipment, housing facilities, and the like.

FIG. 1 shows an embodiment of a mold for molding a first molded body of the present invention, and a molded body having a coating film on the surface of an inner surface formed by a bottom wall and a vertical wall. It is a schematic sectional drawing of the rectangular longitudinal direction in the state where the male die and female die for manufacturing were closed. FIG. 2 is a cross-sectional view of the main part of the II portion of FIG. FIG. 3 is a cross-sectional view of relevant parts similar to FIG. FIG. 4 shows an embodiment of a mold for molding the second molded body of the present invention, and a molded body having a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall. It is a schematic sectional drawing of the rectangular longitudinal direction in the state where the male die and female die for manufacturing were closed. 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 relevant parts similar to FIG. FIG. 7 is a cross-sectional view in the horizontal direction of the cross section of the 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. FIG. FIG. 8 is a cross-sectional view of the main part in the horizontal direction similar to FIG. FIG. 9 is a cross-sectional view of the main part of the female mold for forming the vertical wall additional ribs.

Explanation of symbols

4 ... Molded body 42 ... Bottom wall 423 ... Rib 424 ... Vertical wall extension rib 425 ... Additional rib 426 ... Depression 429 ... Depression 44 ... Vertical wall 448 ... Thick part 449 ... Depression 6 ... Coating film 20 ... Mold Apparatus 22 ... Dividing surface 24 ... Male mold 26 ... Female mold 28 ... Cavity 281 ... First cavity 282 ... Second cavity 283 ... Third cavity 284 ... Fourth cavity 285 ... Fifth cavity 286 ... Projection 288 ... Depression Portion 289 ... Vertical wall additional rib forming cavity 30 ... Mixer 32 ... Coating material injection device 34 ... Coating material injection port 60 ... Clearance

  The molded body according to 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 covers a surface of an inner surface portion formed by the bottom wall and the vertical wall. A molded body having a membrane, comprising at least one rib extending in the outer direction of the bottom wall, wherein at least one rib is formed as a vertical wall extension rib on the vertical wall extension line, and In addition to the vertical wall extension rib, at least one additional rib extending in the outer direction of the bottom wall is formed 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. (This molded body may be referred to as a “first molded body”).

  Further, another molded body 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 the surface of the inner surface portion formed by the bottom wall and the vertical wall. A molded body having a coating film thereon, having at least one rib extending in the outer direction of the bottom wall, and at least one of the ribs is formed as a vertical wall extension rib on the vertical wall extension line. Furthermore, at least one depression is formed on the bottom wall outer surface of the molded body at a position within 50 mm from the vertical wall extension rib toward the center of the bottom wall outer surface of the molded body. (This molded product may be referred to as a “second molded product”).

Hereinafter, the molded article of the present invention will be described with reference to the drawings.
FIG. 1 shows an embodiment of a mold for forming a tray-shaped molded body having a rectangular bottom wall according to an embodiment of the first molded body of the present invention, and is formed by a bottom wall and a vertical wall. It is a schematic sectional drawing of the rectangular longitudinal direction of the state where the male metal mold | die and female metal mold | die for manufacturing the molded object which has a coating film on the surface of the inner surface part made are closed. FIG. 2 is a cross-sectional view of the main part of the II portion of FIG. FIG. 3 is a cross-sectional view of relevant parts similar to FIG. FIG. 4 shows an embodiment of a mold for forming a bonnet-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. It is a schematic sectional drawing of the rectangular longitudinal direction of the state where the male metal mold | die and female metal mold | die for manufacturing the molded object which has a coating film on the surface of the inner surface part made are closed. 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 relevant parts similar to FIG. FIG. 7 is a horizontal cross-sectional view of a main part of a vertical wall crossing portion 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. FIG. 8 is a horizontal cross-sectional view of the main part similar to FIG. FIG. 9 shows that a vertical wall additional rib is formed at a vertical wall intersection 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 in the case of forming.

The molded article of the present invention is preferably formed from a norbornene resin.
In the present invention, the molded body 4 has a bottom wall 42 and a vertical wall 44 that rises at a predetermined angle from at least a part of 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 a rectangle, 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.
In the molded body of the present invention, the maximum diameter of the bottom wall portion is preferably 200 mm or more, particularly preferably 500 mm or more.
In the molded body of the present invention, the bottom wall thickness t1 ′ is preferably 3 to 10 mm, and the vertical wall thickness t2 ′ is preferably 3 to 10 mm.

The angle of the vertical wall rising from the peripheral part 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 vertical wall may be formed on a part of the bottom wall or may be formed all around the bottom wall. When the vertical wall is formed over the entire circumference of the bottom wall, the molded body becomes a basin-shaped molded body.

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. In the present invention, 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 examples thereof include paints; various hard coat agents such as fluororesin lacquer, silicone resin lacquer, and silane hard coat agent; artificial marble syrup; Are preferably used.
Although the thickness of a coating film is not specifically limited, Usually, 30-500 micrometers, Preferably it is 100-300 micrometers.

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”, hereinafter the same). 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 within the cross-section of the member to reinforce the thin-walled member. In addition, a truncated cone shape, a prismatic shape, a truncated pyramid shape and the like are also included.
In addition, the ribs may be independent or partially or entirely continuous.

As for the size of the rib, when the rib is plate-like, the width (in the case of having a draft angle, the width of the maximum portion) is preferably 2 to 20 mm, and particularly preferably 5 to 15 mm.
When the rib has a truncated cone shape, 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 upper surface of the truncated cone (the side far from the bottom wall). 5 to 40 mm, preferably 7 to 35 mm, and more preferably 9 to 30 mm on the side close to the bottom wall.
Further, in the case of a truncated pyramid shape, a short piece having 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), and the bottom surface of the truncated cone ( 5 to 40 mm, preferably 7 to 35 mm, and more preferably 9 to 30 mm on the side close to the bottom wall.

The height t3 ′ of the rib 423 is not particularly limited, but is usually 5 to 100 mm, preferably 10 to 50 mm, and more preferably 15 to 35 mm in a large-sized molded body such as a washing place bread and a washing machine bread.
The arrangement of the ribs 423 is not particularly limited, but usually the ribs are parallel to each other or a lattice is formed. The interval between the adjacent ribs 423 in parallel is desirably wide as long as the flatness or strength of the bottom wall portion of the molded body is maintained. In a large molded body such as a washing place bread and a washing machine pan, 100 mm. Above, preferably 150 mm or more.
A boss portion (not shown) may be formed on the bottom wall 42 in addition to or together with the plurality of ribs 423.

In the molded body of the present invention, 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 over the entire vertical wall extension, or may be formed on a part of the vertical wall extension.

In the first molded body of the present invention, in addition to the at least one rib 423, at least one additional rib 425 (see FIG. 3) extending in the outer direction of the bottom wall extends from the vertical wall extension rib 424 to the bottom wall outer surface of the molded body. It is formed at a position within 50 mm toward the center of the part. The distance L1 between the ribs 424 and 425 refers to the shortest distance between the cross sections when the ribs are 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.
In the present invention, the formation position of the additional rib 425 is preferably within 40 mm, particularly preferably within 30 mm, from the vertical wall extension rib 424 toward the center of the outer surface of the bottom wall of the molded body.

  By forming the additional rib 425 in the molded body of the present invention, a uniform coating film having no coating defects is formed. That is, shrinkage occurs in the horizontal direction (direction parallel to the bottom wall of the molded body) during molding, but the additional rib 425 is locked by the corresponding female mold cavity 285 (see FIG. 1). In particular, the 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 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.

In the second molded body of the present invention, instead of the additional rib 425 in the first molded body, it is on the bottom wall outer surface portion of the molded body and from the vertical wall extension rib 424 to the center direction of the bottom wall outer surface portion of the molded body. At least one depressed portion 426 is formed at a position within 50 mm toward (see FIG. 6). The distance between the rib 424 and the depressed portion 426 is the outer edge of the depressed portion formed by the cross section when the rib 424 is virtually cut at the outer surface of the bottom wall of the molded body, and the depressed portion 426 and the outer surface of the bottom wall of the molded body. The shortest distance between.
The shape of the depressed portion is not particularly limited, but may be a shape obtained by cutting a sphere (true sphere or elliptic sphere) or a cuboid (cube or cuboid) by a plane.
As for the size of the depressed portion, generally, the depth t6 ′ (see FIG. 6) is preferably 1 to 8 mm, and the maximum diameter of the outer edge of the depressed portion is 5 to 40 mm.
In the present invention, the position where the depression 426 is formed needs 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.

  In the molded body of the present invention, by forming the depressed portion 426, a uniform coating film having no coating defect is formed. That is, although horizontal shrinkage occurs during molding, the depressed portion 426 is locked by the female mold projection 286 (see FIG. 4) corresponding thereto, so that the bottom wall particularly near the vertical wall portion of the molded body is obtained. Shrinkage of the part is 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.

  In the present invention, the molded body may have an additional rib 425 and a depressed portion 426 formed at different locations at the same time.

The molding of the present invention having a bottom wall and a vertical wall rising at a predetermined angle from at least a part of the outer edge of the bottom wall, and having a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall In the body, when the bottom wall has a polygonal outer edge and the vertical walls rising from the outer edge of the polygon are adjacent to each other, the thick wall portion 448 ( (See FIG. 8). The thick part may be provided on the entire surface in the vicinity of the intersecting part, or may be provided on a part thereof. In addition, the shape of the thick part 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 in a cross section of a corresponding male mold in the height direction of the trapezoidal column or the column A shape cut by two wall surfaces in the vicinity of the intersection of adjacent vertical walls can be exemplified.
When the molded body has a polygonal bottom wall, when the coating film is formed on the surface of the inner surface by in-mold coating after reaction injection molding, the vertical wall outer surface intersecting portion of the male mold 24 and the molded body are formed. Since the gap between the vertical wall inner surface intersections 4 and the gap becomes small, a band-like portion where no coating film is formed may occur. By forming the thick portion 448 on the outer surface vertical wall at the intersection of the adjacent vertical walls, a depression 449 due to sink marks (see FIG. 8) is formed at the inner surface of the adjacent vertical body vertical wall at the time of molding. It is formed. This recess 449 prevents the vertical wall outer surface intersection of the male mold 24 and the vertical wall inner surface intersection of the molded body 4 (so-called “hugging”), and acts as a liquid pool. A coating agent spreads along the intersection of adjacent vertical walls, and a uniform coating film free from 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.

In the molded body of the present invention, 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 provided on the outer surface of the vertical wall 44 of the molded body. It is also possible (see FIG. 9). Thereby, especially the uniformity of the coating film of a vertical wall part inside a molded object can be improved. In this case, it is desirable that the vertical wall additional ribs be provided continuously from the upper end to the lower end of the vertical wall in the mold releasing direction of the vertical wall surface in order to smoothly remove the mold. When the molded body is cut along a plane perpendicular to the mold opening direction, 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, and 30 mm. It is particularly preferred that
In the molded body of the present invention, 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. Thereby, especially the uniformity of the coating film of a vertical wall part inside a molded object can be improved. In this case, it is necessary to provide a protrusion on the vertical wall of the female mold in order to provide the depression, but this protrusion will advance and become a protrusion at the time of molding, and the female mold will be divided at the time of mold release. It is preferable to have a slidable structure so that it can be retracted to the surface.

As an example of a large-sized molded object, a bathtub, a washing place bread of a unit bath, a washing machine bread, etc. can be mentioned.
For example, a drain outlet having a diameter of about 50 to 200 mm may be formed on the bottom wall of these molded bodies. Moreover, you may form the wall standing surface for arrange | positioning the wall panel of a unit bath in the vicinity of the upper end part of the outer periphery of a washing-room pan.

  The mold of 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 a coating film is formed on a surface of an inner surface portion formed by the bottom wall and the vertical wall. Is for producing a molded body having a reaction injection molding. The mold of the present invention is particularly suitable for manufacturing 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 rising at a predetermined angle from at least a part of the outer edge of the bottom wall, and covers the surface of the inner surface portion formed by the bottom wall and the vertical wall. A mold for producing a molded body having a film by reaction injection molding and in-mold coating, and a mold perpendicular to the divided surface for forming a cavity inside the mold by clamping the mold at the divided surface The male mold has a male mold and a female mold that can be divided in the opening direction, and the male mold has a coating film forming coating agent inlet, and is formed on the bottom wall portion on the divided surface side of the female mold. Is formed with a cavity for forming at least one rib extending in the outer direction of the bottom wall of the molded body, and at least one of the cavities is formed by a male mold and a female mold. Formed as a cavity for rib formation on the vertical wall extension on the extension line of the cavity Further, in addition to the cavity for forming the at least one rib, at least one cavity for forming the additional rib extending in the outer direction of the bottom wall of the molded body is formed from the vertical wall extension rib forming cavity. It is formed in the position within 50 mm toward the bottom wall formation part center direction of a female metal mold | die. 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 the surface of the inner surface formed by the bottom wall and the vertical wall A mold for producing a molded body having a coating film thereon by reaction injection molding and in-mold coating, and for clamping the mold on the divided surface to form a cavity inside the mold. 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, on the split surface side of the female mold. A cavity for forming at least one rib extending in the outer direction of the bottom wall of the molded body is formed in the bottom wall portion, and at least one of the cavities is formed of a male mold and a female mold. A vertical wall extension rib forming cavity on an extension line of the vertical wall forming cavity; Further, on the surface of the female mold on the dividing surface side, at a position within 50 mm from the formed body vertical wall forming cavity toward the center of the bottom wall forming portion of the female mold. It has at least 1 protrusion part which goes to a male metal mold | die direction, It is characterized by the above-mentioned. This mold is a mold for molding the second molded body of the present invention (hereinafter, simply referred to as “second mold”).

Hereinafter, the metal mold | die which concerns on this invention is demonstrated based on drawing.
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 a mold opening direction X perpendicular to the dividing surface 22. The cavity 28 is formed inside the mold by clamping the male mold 24 and the female mold 26 with the dividing surface 22.

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.
As shown in FIGS. 1 to 3, the first cavity 281 is a gap for forming the bottom wall 42 of the molded body 4, and includes a second cavity 282, a third cavity 283, a fourth cavity 284, and a fifth cavity. 285.
The third cavity to the fifth cavity are formed in the bottom wall portion on the dividing surface side of the female mold toward the outer side of the molded body bottom wall.
The width t1 of the first cavity 281 is determined in consideration of the thickness t1 ′ of the bottom wall 42 of the molded body 4. For example, in the case of a washing place bread etc., this width t1 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. For example, in the case of a washing place bread or the like, 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.
In general, molding shrinkage is large in the vertical direction of the molded body and small in the horizontal direction parallel to the bottom wall of the molded body. For this reason, in a molded body having a vertical wall portion or a molded body including a concave shape, the molded body vertical wall inner surface and a male mold vertical wall portion facing this are formed by contraction in the thickness direction which is the horizontal direction of the vertical wall. The gap between the outer surface tends to be small and the coating agent is difficult to circulate.
At this time, by setting the width t2 of the second cavity 282 corresponding to the vertical wall 44 of the molded body 4 to be thick, molding shrinkage in the thickness direction of this portion can be increased, and as shown in FIG. A gap 60 between the inner surface intersecting portion of the vertical wall 44 of the molded body 4 after curing and the outer surface intersecting portion of the vertical wall of the male mold 24 can be secured. As a result, 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. Note that the third cavity 283 includes a gap for forming the boss portion when the boss portion (not shown) is formed in addition to or together with the rib 423.
As shown in FIG. 1, the 3rd cavity 283 for forming the rib 423 of a molded object is formed in the bottom wall part by the side of the division surface of a female metal mold | die.
The shape of the third cavity 283 is not particularly limited, and examples thereof include a plate shape, a columnar shape, a truncated cone shape, a truncated pyramid shape, a prismatic shape, and a truncated pyramid shape, and a plate shape is preferable.
The third cavity 283 may be composed of a plurality of independent cavities, and may be a partially or wholly continuous cavity.
The depth t3 of the third cavity 283 is usually 5 to 100 mm, preferably 10 to 50 mm, and more preferably 15 to 35 mm.
When the third cavity 283 is plate-like, the width of the third cavity (when the rib has a draft angle, the width of the maximum portion) is preferably 2 to 20 mm, particularly preferably 5 to 15 mm.
When the third cavity 283 has a truncated cone shape, 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, more preferably 9 to 30 mm on the bottom surface (side closer to the bottom wall of the molded body).
In the case of a truncated pyramid shape, a short piece having 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 bottom wall of the molded body).

The arrangement of the third cavities 283 is not particularly limited, but usually the cavities are parallel to each other or a lattice is formed. It is desirable that the interval between the third cavities 283 adjacent in parallel is wide as long as the flatness or strength of the bottom wall portion of the molded body is maintained. In a large molded body such as a washing place pan or a washing machine pan, , 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.

In the mold according to the present invention, at least one of the third cavities 283 includes a second cavity 282 (hereinafter referred to as a “longitudinal wall extension rib forming cavity”). Formed on the extension line of the 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 over the entire vertical wall extension part, or may be formed on a part of the vertical wall extension part.

By using the mold having the vertical wall extending rib forming cavity 284, the coating film in the vicinity of the intersection between the bottom wall of the molded body and the vertical wall 44 rising from this can be made uniform.
That is, due to the presence of the vertical wall extension rib forming cavity 284, a recess 429 due to contraction 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). The recess 429 prevents the corner portion of the bottom wall on the male mold dividing surface side and the corner portion of the inner surface portion of the molded body from sticking, and a liquid pool is formed when the coating agent flows along the vertical wall from the bottom wall of the molded body. It helps the distribution of the coating.

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 cavities is 50 mm or less from the vertical wall extending rib forming cavity 284 toward the center of the bottom wall forming portion of the female mold.
The distance between both cavities is preferably 40 mm or less, particularly preferably 30 mm or less.
The distance between the cavities refers to the shortest distance between the cavities on the divided surface when the two cavities are viewed from a direction perpendicular to the divided surface of the male mold and the female mold.
The shape of the fifth cavity 285 is not particularly limited, and includes a plate shape, a columnar shape, a truncated cone shape, a truncated pyramid shape, a prismatic shape, a truncated pyramid shape, and the like, and a plate shape is preferable.
The fifth cavity 285 may be composed of a plurality of independent cavities, and may be a partially or wholly continuous cavity.
The depth t5 of the fifth cavity 285 is usually 5 to 100 mm, preferably 10 to 50 mm, and more preferably 15 to 35 mm.
When the fifth cavity 285 has a truncated cone shape, 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 molded product bottom wall). It is 5 to 40 mm, preferably 7 to 35 mm, more preferably 9 to 30 mm on the bottom surface (side closer to the bottom wall of the molded body).
In the case of a truncated pyramid shape, a short piece having 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 bottom wall of the molded body).
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.

By using a mold having the fifth cavity 285, it is possible to make the coating film in the portion adjacent to the vertical wall portion of the bottom wall portion of the molded body uniform without any coating defects.
That is, although shrinkage occurs in the horizontal direction during molding, the fifth cavity 285 engages the rib 425 corresponding thereto, and thereby the 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.

In the second mold of the present invention, instead of the fifth cavity 285 in the first mold of the present invention described above, the molded body vertical wall forming cavity 282 is provided on the surface on the dividing surface side of the female mold. At least one protrusion 286 directed toward the male mold at a position within 50 mm, preferably within 40 mm, particularly preferably within 30 mm from the center of the female mold toward the bottom wall forming portion ( (See FIG. 5).
This protrusion is for forming the depression 426.
The shape of the protrusion is not particularly limited, but may be a shape obtained by cutting a sphere or a cuboid with a plane.
As for the size of the protrusion 286, 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.

By using the metal mold having the projections 286, it is possible to make the coating film in the portion adjacent to the vertical wall portion of the bottom wall portion of the molded body uniform without any coating defects.
That is, although horizontal shrinkage occurs during molding, the protrusion 286 engages the corresponding recessed portion 426 of the molded body 4, thereby suppressing the shrinkage of the bottom wall portion in the vicinity of the vertical wall portion of the molded body. The 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 molding of the present invention having a bottom wall and a vertical wall rising at a predetermined angle from at least a part of the outer edge of the bottom wall, and having a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall In a mold for molding a body, if the bottom wall has a polygonal outer edge and is a mold for molding a molded body having adjacent vertical walls rising from the outer edge of the polygon, the molded body It is preferable that the female mold part corresponding to the outer surface crossing part of the adjacent vertical walls has a depressed part. That is, a depression (in the female mold is formed so that a space is formed between the female mold and the virtual two wall surfaces in the vicinity of the outer surface intersection formed by the extended surfaces of the outer surfaces of the adjacent vertical walls of the molded body. It is preferable to provide FIG.
It is preferable that the depressed portion has substantially the same height as the vertical wall portion. In addition, the shape of the depressed portion is not particularly limited, but a part of a trapezoidal column or a column having a trapezoidal shape, a circular shape, an elliptical shape or the like is adjacent to a corresponding male mold in the height direction of the trapezoidal column or the column. A shape cut by two wall surfaces in the vicinity of the intersecting portion of the matching vertical walls can be exemplified.
It is preferable that the depth t8 of the depression (distance from the adjacent vertical wall intersections of the male mold) is 1.3 to 3 times the thickness of the vertical wall.
In addition, when forming a vertical wall addition rib in a molded object, as shown in FIG. 9, what is necessary is just to use the metal mold | die which formed the space 289 which can form a vertical wall addition rib in the predetermined position from the depression. .

  When the molded body has a polygonal bottom wall, when the coating film is formed on the surface of the inner surface by in-mold coating after reaction injection molding, the vertical wall outer surface intersecting portion of the male mold 24 and the molded body are formed. 4 may be in close contact with the vertical wall inner surface intersecting portion, and a gap may not be generated. As a result, a band-like portion where a coating film is not formed may be generated. By forming depressions 288 in the mold at the intersections of the adjacent vertical walls, 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 ( (See FIGS. 7 and 8). The recess 449 prevents the corner of the male mold 24 and the molded body 4 from adhering to each other (so-called “holding”), and acts as a liquid pool. As a result, at the intersection of the adjacent vertical walls. A coating agent spreads along, and a uniform coating film without a coating defect 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 inlets may be one, but since the flow rate of the coating agent is generally inversely proportional to the distance from the coating agent inlet, a plurality of, usually 2 to 4, preferably 2 to 3 When the inlet is provided, the coating agent can be injected more effectively. The distance between two adjacent coating agent injection ports is usually 0.5 to 3 m, preferably 0.8 to 2 m. In the case where there are a plurality of injection ports, bubbles may be generated at the junction of the coating material injected from each injection port.
In one embodiment of the mold of the present invention shown in FIG. 1, the male mold has a coating agent inlet 34. A coating material injection device 32 is attached to the coating material injection port. The inner diameter of the coating agent injection port 34 may be, for example, about 10 to 15 mm in diameter. When a plurality of coating agent injection ports 34 are provided, the inner diameter may be different for each injection port. The coating agent is injected into the gap 60 (see FIGS. 3 and 6) between the molded body and the outer wall of the male mold from the coating agent injection port 34.
In the mold of the present invention, an injection port for injecting a reaction stock solution is formed in a part of the dividing surface 22, and a mixer 30 (for injecting a reaction stock solution for producing a molded body) (Not shown).

When reaction injection molding and in-mold coating are performed using the mold of the present invention, burrs are formed at locations corresponding to the end, runner, and opening of the molded body, and the molded body is molded and coated with a coating agent. It is preferable that the coating is performed completely to the end of the molded body.
For this reason, it is preferable to provide a guide for forming a burr at a position corresponding to the end portion, the runner, and / or the opening portion of the obtained molded body. The guide tip 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. Moreover, 2-100 mm is preferable and, as for the width | variety of a burr | flash, 10-50 mm is especially preferable.
Moreover, in order to reinforce prevention of the leakage of the coating material, it is preferable to have a protrusion shape described in Japanese Patent Application No. 2005-132057 at the inflow side adjacent portion of the coating material of this guide. The height of the protrusions of the molded body formed thereby is preferably 0.1 mm or more and 20 mm or less, more preferably 1 mm or more and 15 mm or less, and particularly preferably 2 mm or more and 10 mm or less.
If the height of the protrusions formed on the molded body is less than 0.1 mm, the effect of preventing leakage of the coating agent cannot be obtained sufficiently, and if it exceeds 20 mm, it is difficult to remove the molded body. Moreover, it is preferable that the top width is smaller than the bottom width because the shape of the protrusion is easy to remove.

When reaction injection molding is performed using a norbornene-based monomer, voids are generated due to molding shrinkage. When in-mold coating is performed on the inner surface of the molded body in this state, if the molded body swings, the gap between which the coating material should flow is the surface on the divided surface side of the molded body and the male mold depending on the location and timing. Since it is blocked by the close contact, there is a possibility that a defect occurs in the coating.
In order to prevent this, it is preferable to provide means for fixing the molded body to the mold as disclosed in International Publication No. 2005/046958. This mold fixing means has a locking structure in which a pin can be projected and retracted from the wall surface on the dividing surface side of the female mold. In order to make the pin retractable, for example, 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 the outside of the mold by a force such as electricity, steam pressure, water pressure, and hydraulic pressure. At the time of reaction injection molding and in-mold coating, the core is preferably protruded from 1 to 50 mm, more preferably from 5 to 12 mm to prevent the molded body from swinging. It is 0 to 20 mm, more preferably 0 to 10 mm.
A plurality of mold fixing means can be installed around the molded body in the horizontal direction of the side surface of the molded body. What is necessary is just to determine the number and space | interval suitably according to the magnitude | size of a molded object.

  The material of the mold is not particularly limited, and specific examples thereof include steel, cast or forged aluminum, zinc alloy casting or thermal spraying, nickel or copper electroforming, nickel, copper, chromium plating, etc. Or a resin or the like. The structure of the mold may be determined in consideration of the pressure when the mixed liquid and the coating agent are injected into the mold. The mold clamping pressure is 0.1 to 9.8 MPa in gauge pressure.

  A molded body having the bottom wall of the present invention and a vertical wall rising at a predetermined angle from at least a part of the outer edge of the bottom wall, and having a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall The manufacturing method of the present invention is a method in which a reaction stock solution for manufacturing a molded body is bulk-polymerized in the above-described mold, and a vertical wall rising at a predetermined angle from a bottom wall parallel to the mold opening surface and at least a part of an outer edge of the bottom wall And during the molding of the molded body in the mold, after the temperature of the molded body reaches the maximum temperature, the injection of the coating agent is started, and the split surface side of the male mold And a step of forming the coating film on the surface of the inner surface portion of the molded body by allowing the coating agent to enter and cure the gap between the inner wall portion formed by the bottom wall and the vertical wall of the molded body.

Hereinafter, the manufacturing method of the present invention using the above mold will be described with reference to the drawings.
First, as shown in FIG. 1, a male mold 24 is combined with a female mold 26 and a dividing surface 22 to form a cavity 28 between the male mold 24 and the female mold 26. The reaction stock solution is supplied to perform 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 usually about 5 to 3,000 cP, preferably about 50 to 1,000 cP at 30 ° C., for example.

The reaction stock solution used in the present invention contains a polymerizable monomer and a polymerization catalyst as essential components, and contains an activator (cocatalyst) as necessary.
As the polymerizable monomer, a cyclic olefin is preferable, and a norbornene monomer is particularly preferable. As the polymerization catalyst, a metathesis (ring-opening) polymerization catalyst is preferable.
The norbornene-based monomer only needs to have a norbornene ring. Specific examples thereof include bicyclic compounds such as norbornene and norbornadiene, tricyclic compounds such as dicyclopentadiene and dihydrodicyclopentadiene, and tetracyclododecene. Mention may be made of tetracycles, pentacycles such as cyclopentadiene trimer, and heptacycles such as cyclopentadiene tetramer. These bicyclic to heptacyclic compounds have hydrocarbon groups such as alkyl groups, alkenyl groups, alkylidene groups, and aryl groups, and polar groups such as ester groups, ether groups, cyano groups, and halogen atoms as substituents. May be. Among them, a tricyclic or higher polycyclic norbornene monomer is preferable because it is easily available and has excellent reactivity, and a tricyclic to pentacyclic norbornene monomer is more preferable.

Specific examples of norbornene monomers include dicyclopentadiene, tricyclopentadiene, cyclopentadiene-methylcyclopentadiene co-dimer, 5-ethylidene norbornene, norbornene, norbornadiene, 5-cyclohexenyl norbornene, 1,4,5,8 Dimethano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 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-methano-1,4,4a, 5 , 6,7,8,8a-octahydronaphthalene, 1,4,5,8-dimethano-1,4,4a, 5,6,7,8,8a-hexahydrona Array type, ethylenebis (5-norbornene), and the like.
Norbornene monomers may be used alone or in combination of two or more.
In addition, monocyclic cycloolefins such as cyclobutene, cyclopentene, cyclopentadiene, cyclooctene, 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 / or compounds with a transition metal atom as a central atom. As transition metal atoms, atoms of Groups 5, 6 and 8 (long period periodic table, the same applies 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.

Metathesis polymerization catalysts having group 6 tungsten or molybdenum as the central metal include metal halides such as tungsten hexachloride; metal oxyhalides such as tungsten chlorine oxide; metal oxides such as tungsten oxide; and tridodecyl ammonium molybdenum. An organic metal acid ammonium salt such as dating or tri (tridecyl) ammonium molybdate can be used.
In these, the organic molybdate ammonium salt is preferable. When these metathesis polymerization catalysts are used, it is preferable to use an organoaluminum compound or an organotin compound as an activator (cocatalyst) for the purpose of controlling the polymerization activity.

In the present invention, it is also preferable to use a metal carbene complex having a metal atom of Groups 5, 6 and 8 as a central metal as a metathesis polymerization catalyst. Of the metal carbene complexes, Group 8 ruthenium and osmium carbene complexes are preferred, and ruthenium carbene complexes are particularly preferred. Because the activity of the catalyst at the time of bulk polymerization is excellent, the productivity of norbornene-based resin moldings is excellent, and the resulting norbornene-based resin moldings have little odor derived from unreacted norbornene-based monomers, and are excellent in productivity. is there.
Among the ruthenium carbene complexes, a ruthenium carbene complex in which at least two carbene carbons are bonded to a ruthenium metal atom, and a group containing a hetero atom is bonded to at least one of the carbene carbons is particularly preferable.

  The amount of the metathesis polymerization catalyst used is usually 0.01 mmol or more, preferably 0.1 mmol or more, and 50 mmol or less, preferably 20 mmol or less, with respect to 1 mol of the monomer used in the reaction. If the amount of metathesis polymerization catalyst used is too small, the polymerization activity will be too low and the reaction will take a long time, resulting in poor production efficiency. If the amount used is too large, the reaction will be so intense that it will cure before it is fully filled in the mold. And the catalyst is likely to precipitate, making it difficult to store homogeneously.

  The activator (cocatalyst) is not particularly limited, and specific 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 diethylaluminum chloride and alkoxyalkylaluminum halides; organotin compounds such as tetrabutyltin; and the like. In addition, when using a ruthenium carbene complex as a metathesis polymerization catalyst, it is not necessary to use an activator.

The amount of the activator used is not particularly limited, but is usually 0.1 mol or more, preferably 1 mol or more, and 100 mol or less, preferably 10 mol or less with respect to 1 mol of the metathesis polymerization catalyst used in the reaction. is there. 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 may be 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 then mixed with the monomer. You may use it, making it difficult to precipitate or improving solubility.

  Moreover, it is preferable to add 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 and the activator monomer solution B are mixed and injected into the mold to start the polymerization. As such a regulator, Lewis base is suitable, and ether, ester, nitrile and the like are used. Specific examples include butyl ether, ethyl benzoate, diglyme and the like. When a polar group-containing monomer is used as the copolymerization monomer, the monomer itself may be a Lewis base, and may also have an action as a regulator. The regulator is preferably added to the solution B containing the activating component.

  In the present invention, in order to improve or maintain the properties of the molded product, various additives may be added to the reaction stock solution within a range that does not impair the adhesion, adhesion, etc. between the cured coating and the molded product. Such additives include reinforcing materials, antioxidants, heat stabilizers, light stabilizers, UV absorbers, fillers, pigments, colorants, foaming agents, antistatic agents, flame retardants, lubricants, softeners, and tackifiers. Agents, plasticizers, mold release agents, deodorants, fragrances, elastomers, dicyclopentadiene-based thermal polymerization resins and hydrogenated products thereof.

  Various additives are added to the catalyst or activator monomer solution; used as a separate monomer solution and mixed with the catalyst or activator monomer solution during reaction injection molding; It is added by the method; What is necessary is just to select suitably the addition method with the kind of additive.

When supplying the reaction stock solution into the cavity 28 for bulk polymerization, it is preferable to set the mold temperature T1 (° C.) of the male mold 24 higher than the mold temperature T2 (° C.) of the female mold 26. (T1> T2). As a result, the surface of the molded body 4 on which the coating film 6 is formed can be a beautiful surface having no sink marks or bubbles, which can contribute to improving the adhesion of the coating film 6.
T1-T2 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 the method for adjusting the mold temperature include adjustment of the mold temperature with a heater; adjustment of the temperature of a heat medium such as temperature-controlled water and oil that is circulated in a pipe embedded in the mold; .

When the bulk polymerization in the cavity 28 proceeds, the molded body 4 made of norbornene resin is obtained, and a gap 60 is generated due to molding shrinkage.
Next, the coating agent is injected into the gap 60 from the coating agent injection port 34 shown in FIG. However, in order to perform more reliable injection, the male mold 24 is slightly opened relatively with respect to the female mold 26, and a sufficient space is provided between the inner surface of the male mold 24 and the molded body 4. After forming the gap 60, the coating agent may be injected.
The coating agent is injected from the coating agent injection port 34 provided in the male mold 24. When a plurality of coating agent injection ports are provided, it is preferable to inject from all the injection ports simultaneously. By injecting at the same time, the coating agent can be put in without injection unevenness.
Note that 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 may be appropriately determined in consideration of the finally obtained coating film thickness.

  The composition of the coating is not particularly limited. For example, an oligomer having at least two (meth) acrylate groups and / or an unsaturated polyester resin (vehicle component), an ethylenically unsaturated monomer (monomer component), 1 It is preferable to use a coating composition containing a polymerization initiator having a half-life temperature of 90 to 135 ° C, an accelerator for organic peroxide polymerization initiator, and a release agent having a melting point of 125 ° C or lower. The polymerization initiator is preferably an organic peroxide polymerization initiator.

  Examples of the oligomer having at least two (meth) acrylate groups that can be used in the present invention include an epoxy acrylate oligomer, a urethane acrylate oligomer, a polyester acrylate oligomer, and a polyether acrylate oligomer.

  The epoxy acrylate oligomer is obtained by an acid ring-opening addition reaction of an epoxy compound and an unsaturated carboxylic acid at a ratio such that a carboxyl group equivalent is 0.5 to 1.5 per equivalent of an epoxy group. Manufactured. Here, typical examples of the unsaturated carboxylic acid include acrylic acid and methacrylic acid.

  The urethane acrylate oligomer can be obtained by batch mixing and reacting a diisocyanate compound, a diol compound and a hydroxyl group-containing (meth) acrylate. Alternatively, a diol compound and a diisocyanate compound are reacted to form a urethane isocyanate intermediate containing one or more isocyanate groups per molecule, and then the intermediate and a hydroxyl group-containing (meth) acrylate group A reaction of a diisocyanate compound with a hydroxyl group-containing (meth) acrylate to form a urethane (meth) acrylate intermediate containing one or more isocyanate groups per molecule, and then the intermediate and diol Examples thereof include a method of reacting with a compound.

Here, various known compounds can be used as the diisocyanate compound. Specific examples include organic diisocyanates such as tolylene diisocyanate, isophorone diisocyanate, polymethylene polyphenyl diisocyanate, 1,2-diisocyanatoethane, hexamethylene diisocyanate, 1,3-bis (isocyanatomethyl) cyclohexane. Can do. These diisocyanate compounds may be used alone or as a mixture.
Examples of the diol compound include alkylene glycol such as ethylene glycol, propylene glycol, diethylene glycol, polyethylene glycol, and polypropylene glycol, and diester diol that is a diester reaction product of dicarboxylic acid or its anhydride. It is done.
Furthermore, examples of the hydroxyalkyl (meth) acrylate include, for example, the general formula: CH ₂ ═C (R) CO ₂ — (C _n H _2n ) —OH (where R is —H or —CH ₃ , and n is 2 to 8 is a positive number) is useful.

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 that can be used in the present invention is produced, for example, by a condensation reaction between an unsaturated dibasic acid such as maleic acid or fumaric acid and a polyhydric alcohol such as ethylene glycol, propylene glycol, or trimethylolpropane. Can do.

Examples of the ethylenically unsaturated monomer that can be used in the present invention include styrene, α-methylstyrene, chlorostyrene, vinyltoluene, divinylbenzene, methyl (meth) acrylate, 1,6-hexanediol diacrylate, and tripropylene. Typical examples include glycol diacrylate, trimethylolpropane tri (meth) acrylate, silicone acrylate, and silicone diacrylate, but are not limited thereto.
The amount of the ethylenically unsaturated monomer is appropriately 20 to 200 parts by weight, preferably 40 to 160 parts by weight, based on 100 parts by weight of the vehicle component, and a coating agent having appropriate curing characteristics and viscosity within this range. Is obtained.

  The organic peroxide polymerization initiator is used for polymerizing the vehicle component and the monomer component. The organic peroxide polymerization initiator preferably has a one-minute half-life temperature of 90 ° C to 135 ° C. Examples of such organic peroxides include bis (4-t-butylcyclohexyl) peroxydi. Carbonate, diisopropyl peroxydicarbonate, t-butylperoxyneodecanoate, t-butylperoxyneohexanoate, t-butylperoxyneoheptanoate, t-hexylperoxyneodecanoate, t -Butyl peroxypivalate, lauroyl peroxide, 2,4,4-trimethylpentylperoxy-2-ethylhexanoate, t-amylperoxy-2-ethylhexanoate, benzoyl peroxide, t-butylperoxide Representative examples include oxy-2-ethylhexanoate, But it is not limited to these.

  Since the cured product of norbornene-based monomer is usually molded at a mold temperature of 65 to 95 ° C., when the one-minute half-life temperature of the organic peroxide polymerization initiator is higher than 135 ° C., the curing time of the coating agent Will be significantly longer and in some cases will not cure at all. On the other hand, if the 1-minute half-life temperature is lower than 90 ° C., the pot life of the coating agent is remarkably shortened, and the gelation may occur in the coating agent injection apparatus, which makes it impossible to inject the coating agent. The compounding amount of the organic peroxide polymerization initiator is 0.1 to 15 parts by weight, preferably 1 to 8 parts by weight, based on 100 parts by weight of the vehicle component.

  Typical accelerators for organic peroxide polymerization initiators include cobalt naphthenate, cobalt octylate, zinc naphthenate, zinc octylate, manganese naphthenate, lead naphthenate, or mixtures thereof. However, it is not limited to these. An appropriate amount of the accelerator is 0.01 to 20 parts by weight, preferably 0.04 to 10 parts by weight per 100 parts by weight of the vehicle component.

As the release agent, a release agent having a melting point of 125 ° C. or lower is preferably used. Typical examples of such release agents include stearic acid, hydroxystearic acid, zinc stearate, soybean oil lecithin, silicone oil, fatty acid esters, and fatty acid alcohol dibasic acid esters.
If the melting point of the release agent is higher than 125 ° C., the molding temperature of the norbornene monomer is usually 65 to 95 ° C. Even if the increase in the surface temperature of the cured product due to the reaction heat of the norbornene monomer is taken into account, The mold 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 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.

The coating agent may be a metal powder, a mold release agent other than the above, a curing accelerator, a polymerization inhibitor, an ultraviolet absorber, a light stabilizer, a coloring pigment, an extender pigment, a conductive pigment, a modified pigment, if necessary. Quality resin, surface conditioner, etc. can be blended.
Examples of the release agent other than the above include fluorine compounds such as silicone oil and hexafluoropropene oligomer, and wax.
Examples of the polymerization inhibitor include hydroquinone, benzoquinone, para-t-butylcatechol, and the like.
Typical examples of the ultraviolet absorber and the light stabilizer include benzotriazole ultraviolet absorbers and triazine ultraviolet absorbers.
Examples of the color pigment include titanium oxide, iron oxide, phthalocyanine blue, phthalocyanine green, and carbon black.
Examples of extender pigments include calcium carbonate, talc, silica, clay, mica, barium sulfate, aluminum hydroxide, and the like.
Examples of the conductive pigment include conductive carbon black and graphite.
The modified resin must be compatible with the vehicle component, and specific examples thereof include polymethyl methacrylate, polyvinyl acetate, saturated polyester, chlorinated polyolefin, and the like.

  The viscosity of the coating agent is preferably 500 to 10,000 mPa · s as measured by a B-type viscometer at 30 ° C. (rotor # 2, 30 rpm) from the viewpoint of suppressing the wraparound of the coating agent and the generation of bubbles, 600 ˜7,000 mPa · s is more preferred, and 700 to 6,000 mPa · s is particularly preferred.

The timing of injecting the coating agent from the coating agent injection port 34 is preferably from the time when the bulk polymerization reaction occurs inside the mold after the norbornene-based monomer or the like is injected into the cavity and the temperature of the molded body reaches the maximum temperature. Is after 5 seconds to within 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 place where the shrinkage of the molded body becomes large and the place where the shrinkage does not become significant becomes significant, and the coating spots may become large and the aesthetics may be significantly lowered.
The mold temperature of the male mold 24 when the coating agent is injected into the gap 60 may be lower than the curing temperature of the coating agent, but after the coating agent is injected, it should be set to be equal to or higher than 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. Conversely, if the injection pressure is too high, the equipment costs will be excessive, and the mold structure will need to be pressure resistant, making it less economical. There is sex.

After injecting the coating agent, 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, there is a risk that the coating will not be sufficiently adhered to the surface of the molded body and the coating may be peeled off. On the other hand, if it is too high, the coating will begin to cure while the coating is being injected. In addition to not being able to inject the agent to every corner, the injection pressure may become higher and the injector and mold may be damaged.
If the curing time is too short, the coating may not be sufficiently cured and the coating may be peeled off. Conversely, if the curing time is too long, the productivity may decrease.

  After the coating agent is cured, 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 a desired size and shape.

In the embodiment described above, 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. In this case, for example, after a coating agent is put into the gap 60 formed between the inner surface of the male mold 24 and the molded body 4 and cured, 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.
Further, the coating film 6 is not necessarily formed on the entire inner surface or outer surface of the molded body, and may be formed only on a part of the inner surface or the outer surface depending on the use of the molded body.

  The embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to these embodiments, and can be implemented in various modes without departing from the scope of the present invention. Of course.

  Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto. In the following, “part” is based on weight unless otherwise specified.

[Example 1]
This will be described with reference to FIG.
A bonnet-shaped molded body having a rectangular bottom wall portion having a vertical end of 1,200 mm and a width of 600 mm, a lower end of 1,190 mm, a width of 590 mm and a height of 150 mm, and a vertical wall portion rising from the entire circumference of the bottom wall portion. A mold made of a forged aluminum female mold and an electroformed male mold was used for molding. In addition, a coating agent injection port 34 was provided at three locations, that is, the central part and the apex of both longitudinal sides of the male die of the mold, and an injector having a maximum injection pressure of 40 MPa was attached to each coating agent injection port. A cavity 284 (draft angle of 2 degrees) having a width of 10 mm, a length of 610 mm, and a depth of 20 mm was provided in the downward extension of the female mold vertical wall. Further, 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 tray-shaped molded body. Furthermore, cavities 283 having the same shape as described above were provided at 200 mm intervals from the cavities 284. Next, a cavity having the same shape as the above was provided at intervals of 200 mm in a direction perpendicular to the cavity to form a lattice.
Also, a female die portion corresponding to the outer wall crossing portion of the bonnet-shaped molded body has a length of 160 mm, a maximum width of 30 mm, a vertical depression 288 having a trapezoidal horizontal cross-sectional shape, and L2 = 25 mm from the depression. Two vertical wall-adding rib forming cavities 289 having a length of 160 mm and a maximum width of 30 mm (the cross-sectional shape in the horizontal direction is plate-like) were provided (see FIG. 9).
Further, SUS fixing pins with a sheath having a diameter of 10 mm, which can be slid substantially perpendicular to the mold releasing direction, were installed at 14 positions at intervals of about 200 mm. This slide width is 3 mm in height from the inner wall surface of the female mold in the “projection” state, and 12 mm in the “depression” state.
In addition, guides and weirs for forming burrs having a width of 30 mm and a thickness of 0.5 mm are formed on the periphery of the basin-shaped body and the runner portion on the upper outer periphery of the female mold, and are orthogonal to the male burrs. Grooves for forming a coating leakage preventing protrusion having a right-angled triangular cross-section in which the lengths of both sides are both 5 mm were provided. The vertical part faces the molded product side. In addition, a protrusion defect portion (about 10 mm in length) was provided at one location of the male groove for air discharge.

  As a reaction stock solution component for reaction injection molding, solution A: a solution mainly composed of dicyclopentadiene having a polymerization catalyst component (manufactured by RIMTEC, trade name “Meton T02A solution”), solution B: dicyclo having a catalyst active component A solution containing pentadiene as a main component [manufactured by RIMTEC, trade name “Meton T02B solution”] was used. Moreover, as a coating agent, 1 part of dibutyl phthalate and bis- (4-t-butylcyclohexyl) are used per 100 parts of a paint mainly composed of urethane acrylate oligomer (trade name “Praglas # 400” manufactured by Dainippon Paint Co., Ltd.). A mixture of 1 part of peroxydicarbonate (trade name “Perkadox 16” manufactured by Kayaku Akzo Co., Ltd.) was used.

(Forming and forming coating film)
The male mold and the female mold are clamped, the 14 fixing pins are set in the “projecting” state, the female mold and the male mold are heated to 40 ° C. and 90 ° C., respectively, and the pressure is 0.49 MPa. Then, using a reaction injection molding machine, equal weight solution A and solution B were collided and mixed in a mixing head, and the obtained reaction stock solution was poured 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 the coating agent into the mold at a pressure of 20 MPa and hold at the mold temperature for 3 minutes. did. Thereafter, the 14 fixing pins were set in the “retracted” state, the mold was opened, and the tray-shaped molded body having the coating film was taken out. As a result of visual observation of the appearance of the design of the tray-shaped molded body, the coating state of the coating film was entirely free from defects on the entire inner surface, and was covered at all portions with a thickness of 100 to 300 μm.

[Comparative Example 1]
Except for using a mold having no cavity 285, operation was performed in the same manner as in Example 1 to obtain a basin-shaped body. When the design appearance of the basin-shaped molded body was visually observed, there was a linear non-painted portion on the bottom wall portion of the basin-shaped molded body, and a coating film could not be formed on the entire inner surface of the basin-shaped molded body.

Claims (12)

  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 coating film on a surface of an inner surface portion formed by the bottom wall and the vertical wall. And at least one rib extending in the outer direction of the bottom wall, and at least one of the ribs is formed on the vertical wall extension line as a vertical wall extension rib, and in addition to the at least one rib, the bottom wall The molded body is characterized in that at least one additional rib extending in the outer direction is formed 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.   The molded body according to claim 1, wherein at least one additional rib is formed at a position within 40 mm from the vertical wall extension rib toward the center of the outer surface of the bottom wall of the molded body.   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 coating film on a surface of an inner surface portion formed by the bottom wall and the vertical wall. At least one rib extending in the outer direction of the bottom wall, and at least one of the ribs is formed on the vertical wall extension line as a vertical wall extension rib, and further on the outer surface of the bottom wall of the molded body. The molded body is characterized in that at least one depression is formed at a position within 50 mm from the longitudinal wall extension rib toward the center of the outer surface of the bottom wall of the molded body.   The at least one depression is formed on the outer surface of the bottom wall of the molded body, and is formed 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. The molded product according to Item.   The bottom wall has a polygonal outer edge, and a thick part is formed at the outer surface intersection of adjacent vertical walls rising from the outer edge of the polygon. The molded object of any one of Claims.   The molded article according to claim 5, wherein the thickness of the thick part is 1.3 to 1.8 times the thickness of the vertical wall.   The molded body according to any one of claims 1 to 6, wherein the maximum diameter of the bottom wall portion of the molded body is 200 mm or more.   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 coating film on a surface of an inner surface formed by the bottom wall and the vertical wall is reacted and injected. A metal mold for manufacturing by molding and in-mold coating, which is moldable in the mold opening direction perpendicular to the dividing surface for clamping the mold on the dividing surface to form a cavity inside the mold The male mold has an inlet for the coating agent for forming the coating film, and the bottom wall portion on the dividing surface side of the female mold has an outer direction of the bottom wall of the molded body. A cavity for forming at least one rib extending in the vertical direction is formed, and at least one of the cavities is formed by a male mold and a female mold on the extension line of the molded body vertical wall forming cavity. Formed as an extension rib forming cavity, and In addition to the cavity for forming at least one rib, at least one cavity for forming an additional rib extending in the outward direction of the bottom wall of the molded body is provided from the cavity for forming the vertical wall extension rib to the bottom of the female mold. The metal mold | die characterized by being formed in the position within 50 mm toward the wall formation part center direction.   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 coating film on a surface of an inner surface formed by the bottom wall and the vertical wall is reacted and injected. A metal mold for manufacturing by molding and in-mold coating, which is moldable in the mold opening direction perpendicular to the dividing surface for clamping the mold on the dividing surface to form a cavity inside the mold The male mold has an inlet for the coating agent for forming the coating film, and the bottom wall portion on the dividing surface side of the female mold has an outer direction of the bottom wall of the molded body. A cavity for forming at least one rib extending in the vertical direction is formed, and at least one of the cavities is formed by a male mold and a female mold on the extension line of the molded body vertical wall forming cavity. It is formed as an extension rib forming cavity, and At least one protrusion that faces the male mold at a position within 50 mm from the formed body vertical wall forming cavity toward the center of the bottom wall forming part of the female mold. A mold characterized by having.   A mold for producing a molded body having a bottom wall having a polygonal outer edge and adjacent vertical walls rising from the outer edge of the polygon, and intersecting the outer surfaces of adjacent vertical walls of the molded body The die according to claim 8 or 9, wherein the die corresponding to the portion has a depressed portion.   The mold according to any one of claims 8 to 10, wherein the maximum diameter of the bottom wall portion of the molded body is 200 mm or more.   The reaction stock solution is bulk polymerized in the mold according to any one of claims 8 to 11, and is formed from a bottom wall parallel to the mold opening surface and at least a part of an outer edge of the bottom wall. A step of forming a molded body having a vertical wall rising at a predetermined angle and during molding of the molded body in the mold, after the temperature of the molded body reaches the maximum temperature, injection of a coating agent is started, The coating agent is inserted into the gap between the mold dividing surface side and the inner surface formed by the bottom wall and vertical wall of the molded body, and cured to form a coating film on the surface of the inner surface of the molded body. 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 a coating film on the surface of the inner surface formed by the bottom wall and the vertical wall. Manufacturing method of a molded object.

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