WO2017154176A1 - Article moulé en résine - Google Patents

Article moulé en résine Download PDF

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Publication number
WO2017154176A1
WO2017154176A1 PCT/JP2016/057641 JP2016057641W WO2017154176A1 WO 2017154176 A1 WO2017154176 A1 WO 2017154176A1 JP 2016057641 W JP2016057641 W JP 2016057641W WO 2017154176 A1 WO2017154176 A1 WO 2017154176A1
Authority
WO
WIPO (PCT)
Prior art keywords
resin molded
molded product
rib
main body
resin
Prior art date
Application number
PCT/JP2016/057641
Other languages
English (en)
Japanese (ja)
Inventor
浩明 藤野
博文 塩川
洋司 平井
Original Assignee
日立化成株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日立化成株式会社 filed Critical 日立化成株式会社
Priority to JP2018503949A priority Critical patent/JP6766868B2/ja
Priority to PCT/JP2016/057641 priority patent/WO2017154176A1/fr
Publication of WO2017154176A1 publication Critical patent/WO2017154176A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor

Definitions

  • the present invention relates to a resin molded product.
  • Replacing metal parts with resin molded products is an effective way to reduce the weight of automobiles.
  • resin molded products are even more effective.
  • As a method for reducing the weight of the resin molded product it is possible to reduce the thickness of the resin molded product.
  • a technique has been adopted in which a reinforcing protrusion called a rib formed integrally with the main body of the resin molded product is provided to compensate for the strength (see, for example, JP-A-2005-313330).
  • FIG. 1 is a schematic cross-sectional view schematically showing a cross section of a resin molded product 10 not provided with ribs
  • FIG. 2 is a schematic cross-sectional view schematically showing a resin molded product 20 provided with ribs.
  • Ba is the width of the main body of the resin molded product 10
  • Ha is the thickness of the main body
  • Bb1 is the width of the main body of the resin molded product 20
  • Hb1 is the thickness of the main body
  • Bb2 is the width of the rib
  • Hb2 is the thickness (height) of the rib.
  • the resin molded product 20 has a thinner main body than the resin molded product 10, by providing the rib, a cross-sectional secondary moment that greatly exceeds the resin molded product 10 is realized, and the strength is greatly improved.
  • a resin molded product provided with ribs may impair the appearance by forming a dent called “sink” on the surface opposite to the surface provided with the ribs due to volume shrinkage after cooling of the molded resin.
  • the present inventors have an object to provide a resin molded product in which the occurrence of sink marks is suppressed.
  • ⁇ 1> a main body and a rib positioned on at least a part of the surface of the main body, and the width A of the bottom surface of the rib is 40% or less of the thickness B of the main body in the portion where the rib is positioned.
  • ⁇ 3> The resin molded product according to ⁇ 1> or ⁇ 2>, wherein the thickness B of the main body is 2.5 mm or more.
  • ⁇ 4> The resin molded product according to any one of ⁇ 1> to ⁇ 3>, wherein a width A of a bottom surface of the rib is 1.6 mm or less.
  • ⁇ 5> The resin molded product according to any one of ⁇ 1> to ⁇ 4>, wherein the thickness B of the main body is 4.0 mm or less.
  • ⁇ 6> The resin molded product according to any one of ⁇ 1> to ⁇ 5>, wherein the resin molded product is formed of a foamed resin.
  • An object of the present invention is to provide a resin molded product in which the occurrence of sink marks is suppressed.
  • the present invention is not limited to the following embodiments.
  • the components including element steps and the like are not essential unless otherwise specified.
  • the term “process” includes a process that is independent of other processes and includes the process if the purpose of the process is achieved even if it cannot be clearly distinguished from the other processes. It is.
  • numerical values indicated by using “to” include numerical values described before and after “to” as the minimum value and the maximum value, respectively.
  • the upper limit value or the lower limit value described in one numerical range may be replaced with the upper limit value or the lower limit value of another numerical range. Good. Further, in the numerical ranges described in this specification, the upper limit value or the lower limit value of the numerical range may be replaced with the values shown in the examples.
  • the content of each component in the composition is the sum of the plurality of substances present in the composition unless there is a specific indication when there are a plurality of substances corresponding to each component in the composition. It means the content rate of.
  • the term “layer” refers to the case where the layer is formed only in a part of the region in addition to the case where the layer is formed over the entire region. Is also included.
  • the resin molded product of the present embodiment has a main body and a rib positioned on at least a part of the surface of the main body, and the width A of the bottom surface of the rib is the thickness of the main body at a portion where the rib is positioned. 40% or less of B (A / B ⁇ 100 ⁇ 40).
  • FIG. 3 is a cross-sectional view schematically showing an example of a portion where the rib is located in the resin molded product of the present embodiment.
  • the rib 1 is formed integrally with the main body 2 so as to protrude from the surface 3 of the main body 2 of the resin molded product, and has a shape that becomes narrower in the protruding direction.
  • the “bottom surface of the rib” means a cross section obtained when the rib 1 is cut from the main body 2 where the inclined surface 4 of the rib 1 rises from the surface 3 of the main body 2.
  • the “width of the bottom surface of the rib” means the distance (arrow A) between the inclined surfaces 4 on both sides of the rib 1 on the bottom surface of the rib 1.
  • the thickness of the main body at the portion where the rib is located means the thickness (arrow B) of the main body 2 at the portion where the rib 1 is located.
  • the resin molded product that satisfies the condition that the width A of the bottom surface of the rib is 40% or less of the thickness B of the main body in the portion where the rib is located is not prone to sink due to the provision of the rib.
  • the width A of the bottom surface of the rib is not particularly limited as long as the above conditions are satisfied.
  • the value of A is preferably as large as possible.
  • it is preferably 0.8 mm or more, and more preferably 1.0 mm or more.
  • the value of A is preferably as small as possible.
  • it is preferably 1.6 mm or less, and more preferably 1.3 mm or less.
  • the thickness B of the main body in the portion where the rib is located is not particularly limited as long as the above condition is satisfied.
  • a larger value of B is preferable.
  • the value of B is preferably as small as possible.
  • it is preferably 4.0 mm or less, and more preferably 3.5 mm or less.
  • the width A of the bottom surface of the rib is preferably 37% or less, more preferably 35% or less of the thickness B of the main body in the portion where the rib is located. From the viewpoint of sufficiently obtaining the reinforcing effect of the resin molded product by the rib, the width A of the bottom surface of the rib is preferably 22% or more of the thickness B of the main body in the portion where the rib is located, and is 25% or more. Is more preferable.
  • the shape when the rib is observed from the protruding direction of the rib is not particularly limited. For example, it may be linear or bent. Further, when a portion defined by a pair of inclined surfaces is considered as one rib, a shape (for example, a lattice shape) by a combination of a plurality of ribs may be used.
  • the height of the rib (the length in the protruding direction of the rib) is not particularly limited. Generally, the height of the rib tends to increase as the width of the bottom surface of the rib increases.
  • the number of ribs provided on the surface of the resin molded product body is not particularly limited. In general, the greater the number of ribs and the shorter the distance between ribs, the greater the reinforcing effect of providing ribs.
  • the size of the resin molded product is not particularly limited. From the viewpoint of realizing the effect of reducing the thickness while maintaining the strength and suppressing the occurrence of sink marks, for example, the area of the main surface (the surface having the largest area) is 180 cm 2 or more. Also good.
  • the resin molded product is formed of a resin in which at least a part is foamed.
  • a resin in which at least a part is foamed By forming at least a part of the resin molded product from a foamed resin, it is possible to reduce the weight even with the same thickness as compared to the case where the resin molded product is formed from a non-foamed resin.
  • the occurrence of sink marks tends to be suppressed as compared with the case where the resin is formed from a non-foamed resin.
  • a portion near the surface of the resin molded product is formed of a non-foamed resin (also referred to as a skin layer), and the inside is a foamed resin May be formed.
  • the manufacturing method is not particularly limited.
  • the resin material is foamed by increasing the volume of the void filled with the resin material by moving to the core (core back), and by cooling in this state, a resin molded product that is a molded product of the foamed resin is manufactured. (Injection foam molding).
  • the rib can be integrally formed on the surface of the main body of the resin material.
  • the resin molded product of desired thickness can be manufactured by adjusting the movement distance of a movable side metal mold
  • Resin used for production of resin molded product is not particularly limited.
  • it can be selected from thermoplastic resins generally used for injection molding.
  • thermoplastic resins generally used for injection molding.
  • Examples include copolymer resins and polycarbonate resins.
  • At least one selected from the group consisting of a polypropylene resin, a composite polypropylene resin, and an acrylonitrile / butadiene / styrene copolymer resin is preferable.
  • the foaming agent When a foaming agent is used for the production of a resin molded product, examples of the foaming agent include organic foaming agents such as azodicarbonamide, inorganic foaming agents such as sodium hydrogen carbonate (also known as sodium bicarbonate, sodium bicarbonate), and the like. At present, in foam molding of automotive interior parts, inorganic sodium hydrogen carbonate is mainly used as a foaming agent, but an organic foaming agent is preferable from the viewpoint of improving coating film performance (warm water resistance, etc.). .
  • organic blowing agent examples include azodicarbonamide (ADCA), N, N-dinitrosopentamethylenetetramine (DPT), 4,4-oxybisbenzenesulfonyl hydrazide (OBSH), hydrazodicarbonamide (HDCA), and the like.
  • Azodicarbonamide (ADCA) is preferred.
  • the resin molded product of this embodiment can be used for various applications.
  • it can be suitably used for applications in which the appearance of the surface of the resin molded product is important, for example, interior and exterior parts of automobiles.
  • the interior and exterior parts of automobiles include a side molding, a locker molding, and a bumper.
  • it can be suitably used as an interior / exterior part that has a high surface smoothness, such as a paint finish, and is easily noticeable in sink marks.
  • test resin molded product 1 Resin material for producing a test resin molded product by mixing 100 parts by mass of a polypropylene resin as a resin and 2 parts by mass of azodicarbonamide (ADCA) as a foaming agent was prepared. Using this resin material, a test resin molded product 1 was produced by injection foam molding.
  • ADCA azodicarbonamide
  • a pair of molds including a movable mold imitating the shape of an automobile rocker molding and a fixed mold were used.
  • the fixed mold was provided with recesses corresponding to the shape of the ribs at arbitrary 30 locations, and 30 ribs (ribs 1 to 30) were formed on the surface of the main body of the test resin molded product 1.
  • Table 1 shows the width (mm) of the bottom surface of each of the ribs 1 to 30.
  • the conditions for injection foaming were a mold temperature of 50 ° C., a cylinder temperature of 220 ° C., a cooling time of 15 seconds, and a resin material temperature of 220 ° C. during injection.
  • the interval between the movable mold and the fixed mold before injection of the resin material was 1.9 mm, and the movable mold was not moved after injection and the resin material was not foamed.
  • test resin molded product 2 Test resin molded product 1 except that after the resin material was injected, the movable mold was moved away from the fixed mold (core back) to foam the resin material. In the same manner as above, a test resin molded product 2 was produced. The distance between the molds after the core back (the thickness of the main body of the resin material) was 3.2 mm.
  • test resin molded product 3 Test resin molded product 1 except that after the resin material was injected, the movable side mold was moved away from the fixed side mold (core back) to foam the resin material. In the same manner as above, a test resin molded product 3 was produced. The distance between the molds after the core back (the thickness of the main body of the resin material) was 2.8 mm.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

La présente invention concerne un article moulé en résine qui comprend un corps principal et une nervure qui est positionnée sur au moins une partie de la surface du corps principal, la largeur A de la surface inférieure de la nervure étant inférieure ou égale à 40 % de l'épaisseur B d'une partie du corps principal où la nervure est positionnée.
PCT/JP2016/057641 2016-03-10 2016-03-10 Article moulé en résine WO2017154176A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2018503949A JP6766868B2 (ja) 2016-03-10 2016-03-10 樹脂成形品
PCT/JP2016/057641 WO2017154176A1 (fr) 2016-03-10 2016-03-10 Article moulé en résine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/057641 WO2017154176A1 (fr) 2016-03-10 2016-03-10 Article moulé en résine

Publications (1)

Publication Number Publication Date
WO2017154176A1 true WO2017154176A1 (fr) 2017-09-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/057641 WO2017154176A1 (fr) 2016-03-10 2016-03-10 Article moulé en résine

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JP (1) JP6766868B2 (fr)
WO (1) WO2017154176A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0970860A (ja) * 1995-09-04 1997-03-18 Asahi Chem Ind Co Ltd 補強リブ付成形品及びその成形方法
JPH1035201A (ja) * 1996-07-29 1998-02-10 Tonen Chem Corp ポリオレフィン樹脂組成物製ホイールキャップ及びその製造方法
JPH1044701A (ja) * 1996-08-02 1998-02-17 Tonen Chem Corp ポリオレフィン樹脂組成物製ホイールキャップ及びその製造方法
JPH11226984A (ja) * 1998-02-13 1999-08-24 Idemitsu Petrochem Co Ltd 厚肉部を有する繊維強化樹脂成形品
JP2002018887A (ja) * 2000-07-12 2002-01-22 Chisso Corp ポリプロピレン樹脂発泡成形体
WO2014027534A1 (fr) * 2012-08-16 2014-02-20 株式会社カネカ Corps moulé ayant une structure de section transversale spécifique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0970860A (ja) * 1995-09-04 1997-03-18 Asahi Chem Ind Co Ltd 補強リブ付成形品及びその成形方法
JPH1035201A (ja) * 1996-07-29 1998-02-10 Tonen Chem Corp ポリオレフィン樹脂組成物製ホイールキャップ及びその製造方法
JPH1044701A (ja) * 1996-08-02 1998-02-17 Tonen Chem Corp ポリオレフィン樹脂組成物製ホイールキャップ及びその製造方法
JPH11226984A (ja) * 1998-02-13 1999-08-24 Idemitsu Petrochem Co Ltd 厚肉部を有する繊維強化樹脂成形品
JP2002018887A (ja) * 2000-07-12 2002-01-22 Chisso Corp ポリプロピレン樹脂発泡成形体
WO2014027534A1 (fr) * 2012-08-16 2014-02-20 株式会社カネカ Corps moulé ayant une structure de section transversale spécifique

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Publication number Publication date
JPWO2017154176A1 (ja) 2019-01-10
JP6766868B2 (ja) 2020-10-14

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