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Thermoplastic elastomer composition and production method therefor

A thermoplastic elastomer and a manufacturing method technology, applied in the field of thermoplastic elastomer compositions, can solve the problems of excellent moldability, heterogeneous mixture, insufficient rubber elasticity, etc., and achieve the effects of excellent ozone resistance and excellent mechanical properties

Active Publication Date: 2021-01-01
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, thermoplastic resins such as polyolefins do not have sufficient rubber elasticity, but are excellent in moldability
If it is a resin composition that combines the excellent properties of cross-linked polar rubber and polyolefin, it is expected to be able to produce molded articles with excellent moldability and rubber elasticity, but when the two lack mixing properties, blending is attempted. It is known that only inhomogeneous mixtures can be obtained, and it is impossible to produce elastic moldings

Method used

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  • Thermoplastic elastomer composition and production method therefor
  • Thermoplastic elastomer composition and production method therefor
  • Thermoplastic elastomer composition and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0193] Hereinafter, the present invention will be described more specifically based on examples, but the present invention is not limited to these examples.

[0194]

[0195] In the following examples and comparative examples, each property was measured or evaluated as follows.

[0196] Number average molecular weight (Mn)

[0197] The number average molecular weight (Mn) is measured by gel permeation chromatography (GPC). Gel permeation chromatography Alliance GPC-2000 manufactured by Waters Co., Ltd. was used for measurement as follows. The separation column uses two TSKgel GMH6-HT and two TSKgel GMH6-HTL, the column size is 7.5mm in diameter, 300mm in length, the column temperature is set to 140 ° C, and the mobile phase uses o-dichlorobenzene (Wako Pure Chemical Industry) and as Antioxidant BHT (Takeda Pharmaceuticals) 0.025% by weight, made to flow at 1.0ml / min, sample concentration was set to 15mg / 10mL, sample injection volume was set to 500 microliters, and a diff...

manufacture example 1

[0226]

[0227] 1 part by mass of maleic anhydride (manufactured by Fujifilm Wako Pure Chemical Industries, Ltd.), 2,5-dimethyl - 0.25 parts by mass of 2,5-bis(t-butylperoxy)hexyne-3 (manufactured by NOF Corporation, trade name PERHEXYNE 25B), using a twin-screw mixer (manufactured by Nippon Steel Works, TEX- 30, L / D=40, using a vacuum vent), extruded at a barrel temperature of 220° C., a screw rotation speed of 200 rpm, and a discharge rate of 80 g / min to obtain a maleic anhydride-modified polypropylene (B-1). The obtained maleic anhydride-modified polypropylene (B-1) was dissolved in xylene, then the obtained xylene solution was poured into acetone, reprecipitated and purified, and the amount of maleic anhydride grafted was measured by IR. It was measured and found to be 0.7% by mass. Moreover, the number average molecular weight (Mn) measured by GPC was Mn28,000.

Embodiment 1

[0229] As the first stage, polycarbodiimide (A-1) (manufactured by Nisshinbo Chemical Co., Ltd., trade name: Carbodilite HMV-15CA, carbodiimide equivalent weight 262 g) which is a carbodiimide group-containing compound was used , Maleic anhydride-modified polypropylene (B-1) and polypropylene (D-1) obtained in Production Example 1 (manufactured by Prime Polymer Co., Ltd., trade name PrimePolypro (registered trademark) F113G, MFR: 3.0 g / 10min) The compounding amount (parts by mass) shown in Table 1 was introduced into an extruder (manufactured by Nippon Steel Works, TEX44, L / D=70), and the barrel temperature was 290°C, the screw speed was 760rpm, and the discharge rate was 1.33 kg / min was melt-kneaded to obtain a reaction product (contact) comprising polycarbodiimide (A-1) and maleic anhydride-modified polypropylene (B-1), and polypropylene (D-1 )Compositions.

[0230] Next, as a second stage, nitrile rubber (C-1) (manufactured by Zeon Corporation, Japan, Nipol 1042, NBR, Moon...

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Abstract

[Problem] The present invention addresses the problem of providing: a thermoplastic elastomer composition that contains a polar rubber having crosslinks, that optionally contains an olefin polymer, that has the components highly dispersed therein in a mutual manner, and that has excellent moldability; and a production method for the thermoplastic elastomer composition. [Solution] The thermoplasticelastomer composition according to the present invention is obtained through dynamic thermal treatment of (A) a carbodiimide group-containing compound, (B) an olefin polymer having a group that reacts with a carbodiimide group, (C) a polar rubber, (D) optionally an olefin polymer, and (E) a crosslinking agent capable of crosslinking the polar rubber (C).

Description

technical field [0001] The present invention relates to a thermoplastic elastomer composition comprising a crosslinkable rubber and an olefin-based polymer, and a method for producing the same. Background technique [0002] Cross-linkable polar rubber is widely used as a material for molded articles having rubber elasticity, and generally by using a cross-linking agent to perform cross-linking simultaneously with molding, a product having good rubber elasticity can be produced. However, when a polar rubber containing a cross-linking agent is molded using a mold, the viscosity becomes high due to the cross-linking reaction, the flow into the mold becomes difficult, and the mold cannot be completely filled. become poorly formed. Therefore, a method for improving the moldability of polar rubber subjected to cross-linking molding has been desired. [0003] However, thermoplastic resins such as polyolefins have insufficient rubber elasticity, but are excellent in moldability. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/00C08J3/24C08L23/02C08L23/26C08L79/00
CPCC08J3/005C08J3/247C08J2309/02C08J2423/12C08J2451/06C08L23/12C08L9/02C08L51/06C08L79/00C08L23/26C08L2205/035C08L2207/04
Inventor 榎本龙弥
Owner MITSUI CHEM INC
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