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Composite formed article comprising vulcanized rubber and thermoplastic elastomer and use thereof

A technology of thermoplastic elastomer and vulcanized rubber, which is applied in the direction of rubber layered products, engine seals, chemical instruments and methods, etc., and can solve the problems of reduced elasticity and stickiness of vulcanized rubber

Inactive Publication Date: 2007-12-19
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if microcrystalline polypropylene such as atactic polypropylene is added, the elasticity of conventional vulcanized rubber may decrease, or the molded product may become sticky over time.

Method used

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  • Composite formed article comprising vulcanized rubber and thermoplastic elastomer and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0148] The present invention will be described below using examples, but the present invention is not limited to these examples.

[0149] In addition, the hardness, tensile strength, and elongation of the vulcanized rubber moldings used in Examples and Comparative Examples, the melting points (Tm) of polyethylene and polypropylene used in Examples and Comparative Examples, and the The measurement and evaluation of the melt flow rate (MFR), hardness, tensile strength, elongation, and peeling form at the time of tensile peeling of the olefinic thermoplastic elastomers used were carried out by the following methods.

[0150] (1) Hardness

[0151] The Shore A hardness was measured based on JIS K6301.

[0152] (Measurement conditions) A sheet was produced with a press molding machine, and the scale was read directly after the probe was touched with a type A measuring device.

[0153] (2) Tensile strength and elongation

[0154] Based on JIS K6301, a tensile test was performed un...

reference example 1

[0160] (Preparation of vulcanized rubber sheet)

[0161] With respect to 100 parts by weight of oil-extended ethylene-propylene-5-ethylene-2-norbornene copolymer rubber (ethylene content: 68 mol%, propylene content: 32 mol%, iodine value: 12, Mooney viscosity [ML 1+4 (125°C)] 63. Oil-extending amount: 10 parts by weight of paraffin-based process oil (manufactured by Idemitsu Yosan (Co., Ltd., trade name PW-380)) relative to 100 parts by weight of rubber, containing 20 parts by weight of block PP (230°C, load 2.16kg, MFR=35g / 10min, Tm=161°C, ethylene content 5.6wt%) (hereinafter abbreviated as EPT-1) was used as the raw material rubber. With the Banbury mixer of volume 1.7 liters [(strain) Kobe Steel Works manufactures, BB-2 type mixing machine], the FEF level carbon black of the raw material rubber EPT-1 of 130 weight parts, 165 weight parts [ Produced by Asahi Carbon Co., Ltd., trade name: Asahi #60G], 30 parts by weight of calcium carbonate [Shiraishi Calcium Co., Ltd., tra...

reference example 2

[0166] Fully mix 15 parts by weight of high-density polyethylene [density (ASTM D 1505): 0.956g / cm2 with a Hanshi mixer (Henshel mixer) 3 , MFR (ASTM D 1238, 190°C, load 2.16kg): 6g / 10 minutes, melting point (Tm): 127°C; hereinafter referred to as HDPE-1],

[0167] 55 parts by weight of oil-extended ethylene-propylene-5-ethylene-2-norbornene copolymer rubber [ethylene content: 78 mol%, propylene content: 22 mol%, iodine value: 13, Mooney viscosity [ML 1+4 (100°C)] 74. Oil filling amount: 40 parts by weight of paraffin-based process oil (manufactured by Idemitsu Yosan (Co., Ltd.), trade name PW-380; hereinafter referred to as EPT-2) for 100 parts by weight of rubber; hereinafter referred to as EPT-2) as rubber Element,

[0168] 30 parts by weight of propylene-ethylene-1-butene terpolymer [MFR (ASTM D 1238, 230°C, load 2.16kg): 7.0g / 10min, melting point (Tm): 136°C; hereinafter referred to as PP-1] as polypropylene,

[0169] 0.1 parts by weight of phenolic antioxidant [manufa...

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Abstract

The formed vulcanized rubber article can form, through melt adhesion and without the use of an adhesive layer, a composite formed article which exhibits satisfactory adhesion strength and causes the parent material failure upon pealing. A formed vulcanized rubber article (1) which comprises 2 to 10 wt % of an olefinic resin exhibiting a crystallinity of 10 % or more as measured with a differential scanning calorimeter (DSC); and a composite formed article which comprises said formed vulcanized rubber article (1) and, joined thereto, a formed article (2) comprising a thermoplastic elastomer containing more than 10 % of an olefinic resin exhibiting a crystallinity of 10 % or more as measured with a differential scanning calorimeter (DSC) and having a gel content of 30 wt % or less. The above composite formed article is advantageously used for an interior or exterior material for an automobile, in particular, for a weatherstrip material.

Description

technical field [0001] The present invention relates to a composite molded body (also referred to as a molded composite) and its use. Corner special-shaped connection parts such as door trims or special-shaped terminal parts. Background technique [0002] In the past, the manufacturing process of the windshield with the connection part is usually to cut the extruded vulcanized product composed of ethylene-propylene-non-conjugated diene terpolymer (EPDM) rubber compound, and install one or both metal parts. For the model, the EPDM rubber mixture and the same type of rubber molding material are injected into the formed cavity for vulcanization molding. [0003] On the other hand, as this molding material, from the viewpoint of productivity, environmental adaptability, and weight reduction, as an alternative to vulcanized rubber using ethylene-propylene-non-conjugated diene terpolymer (EPDM), non-vulcanized Process thermoplastic elastomer (composition). [0004] However, in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/12B32B25/04B60J10/00B60R13/06B29C45/14C08L21/00B29C45/00B29K19/00
CPCB60R13/06B29C45/0001B60J10/0005B60J10/0022B32B25/04C08J5/121B29C45/14409B60J10/2335B60J10/16B60J10/21Y10T428/31913B29C45/14B29C70/84B29C70/845B60J10/00C08J5/12C08L21/00
Inventor 今井正
Owner MITSUI CHEM INC