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Polypropylene resin, polypropylene resin composition, and foam-injection-molded article

A technique of polypropylene-based, injection-molded foaming, applied in the field of polypropylene-based resins, polypropylene-based resin compositions, and injection-molded foamed moldings, capable of solving the physical properties of molded objects (reduced impact resistance, insufficient, unsuitable for injection molding) Foam molding and other problems, to achieve excellent fluidity and foamability, less silver streaks and flow marks, and good surface appearance

Active Publication Date: 2012-07-11
KANEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although fluidity can be further improved by this method, there are cases where the physical properties (impact resistance) of the molded article are lowered by using wax
Especially when obtaining a thin-walled injection foamed product with a high expansion ratio exceeding 2 times, it is necessary to reduce the initial cavity gap, and there is a case of insufficient filling in a large mold
In addition, the melt tension also has a great influence on the melt flow rate. If the melt flow rate is low, the melt tension will easily become higher. Therefore, for high-fluidity polypropylene resins whose melt flow rate exceeds 30g / 10 minutes, As an indicator of foamability, the regulation of melt tension of 5 cN or more is not sufficient
[0010] On the other hand, a method of using a polypropylene-based resin in which both melt tension and loss tangent are specified for extrusion foaming has also been proposed (Patent Document 7), but this is a low-melting resin suitable for extrusion foaming. Volume flow rate resin, not suitable for injection foam molding
[0011] As described above, it is difficult to obtain a polypropylene-based resin with better fluidity and foamability for injection foam molding using a large mold, including countermeasures against the aforementioned poor appearance

Method used

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  • Polypropylene resin, polypropylene resin composition, and foam-injection-molded article
  • Polypropylene resin, polypropylene resin composition, and foam-injection-molded article
  • Polypropylene resin, polypropylene resin composition, and foam-injection-molded article

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116]

[0117] 100 parts by weight of a propylene homopolymer (manufactured by Prime Polymer Co., Ltd., J108M) having a melt flow rate of 45 g / 10 minutes as a linear polypropylene-based resin and peroxyisopropyl carbonic acid as a radical polymerization initiator The mixture of 1.0 parts by weight of tert-butyl ester was supplied to a twin-screw extruder (L / D=40) of 45 mmΦ from a hopper at a rate of 70 kg / hour, melted and kneaded at a barrel temperature of 200 ° C, and was set in the middle using a quantitative pump. 0.3 parts by weight (speed of 0.21 kg / hour) of isoprene monomer as a conjugated diene compound was supplied in the press-in part of the above-mentioned twin-screw extruder for melt-kneading to obtain modified polypropylene Resin-like particles.

[0118] The evaluation of the obtained modified polypropylene-based resin is shown in Table 1.

[0119]

[0120] To 100 parts by weight of the obtained modified polypropylene-based resin, 7.5 parts by weight of a sod...

Embodiment 2

[0123]

[0124] The same operation as in Example 1 was carried out except that the mixing amount of tert-butyl peroxyisopropyl carbonate was changed to 0.4 parts by weight, and the supply amount of isoprene was changed to 0.35 parts by weight to obtain a modified polymer. acrylic resin.

[0125]

[0126] Injection foaming was performed in the same manner as in Example 1 to obtain an injection foamed molded body.

[0127] The evaluation of the obtained modified polypropylene-based resin is shown in Table 1, and the evaluation of the injection-foamed molded product is shown in Table 2.

Embodiment 3

[0129]

[0130] The same operation as in Example 1 was carried out, except that the mixing amount of tert-butyl peroxyisopropyl carbonate was changed to 0.4 parts by weight, and the supply amount of isoprene was changed to 0.4 parts by weight to obtain a modified polymer. acrylic resin.

[0131]

[0132] Injection foaming was performed in the same manner as in Example 1 to obtain an injection foamed molded body.

[0133] The evaluation of the obtained modified polypropylene-based resin is shown in Table 1, and the evaluation of the injection-foamed molded product is shown in Table 2.

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Abstract

Provided are a polypropylene resin and a polypropylene resin composition that contains the aforementioned polypropylene resin and is used in foam injection molding. The provided polypropylene resin and propylene resin composition have excellent fluidity and foamability, and particularly when used in foam injection molding, allow forming with low initial cavity clearance even in large molds, thereby making it possible to obtain thin foam-injection-molded articles with large surface areas and good external appearances. The polypropylene resin is characterized by being obtained by melt-mixing a linear polypropylene resin, a radical polymerization initiator, and a conjugate diene compound. The polypropylene resin is further characterized by: a melt flow rate greater than 30 g / 10 min and no greater than 250 g / 10 min, measured at 230 DEG C and with a load of 2.16 kg; a melt tension at 200 DEG C of at least 0.3 cN; and a loss tangent (tan d) less than or equal to 6.0, said loss tangent being the ratio between the storage elastic modulus and the loss elastic modulus as measured by dynamic viscoelastic measurement at a temperature of 200 DEG C and an angular frequency of 1 rad / s.

Description

technical field [0001] The present invention relates to a polypropylene-based resin, a polypropylene-based resin composition, and an injection-foamed molded product suitable for injection-foaming molding. Background technique [0002] Polypropylene resin has good physical properties and moldability, and its application range is rapidly expanding as an environmentally friendly material. In particular, in the field of automobile parts and the like, polypropylene resin products that are lightweight and excellent in rigidity are provided. One of such products is an injection-foamed molded body of polypropylene-based resin. [0003] As a polypropylene-based resin foam-molded product, there is an extruded foam sheet obtained by melt-mixing a mixture containing a polypropylene-based resin and a foaming agent with an extruder and extruding it under atmospheric pressure, and forming an extruded foam sheet obtained by the extruder. Sandwich moldings, and moldings obtained by filling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06B29C45/00C08F2/44C08F255/02C08J9/04B29K23/00B29K105/04
CPCC08L2205/025C08L23/10C08J9/0014C08L23/12C08J2323/12C08F210/06C08F110/06C08F34/04C08L23/04C08L2205/02C08F2500/12C08F2500/23C08F2500/11C08F210/16B29C44/42C08J9/04C08L9/00
Inventor 大仓彻雄阿部辉正中山亮二
Owner KANEKA CORP
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