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Thermoplastic silicone polyamide elastomers made of nylon resin

A thermoplastic elastomer, siloxane technology, applied in the field of thermoplastic elastomer compositions, can solve problems such as no teaching

Inactive Publication Date: 2003-10-01
DOW CORNING CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Although the above publications describe the preparation of compositions using various thermoplastic resins as a matrix and a dispersed phase consisting of a silicone oil or an elastomer in which it is dynamically vulcanized, neither of these references, known to the applicant Nor does any technology teach the preparation of TPSiV elastomers based on polyamide resins with excellent tensile and elongation properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0080] The following examples serve to further illustrate the compositions and methods of the present invention. Unless stated to the contrary, all parts and percentages in the examples are on a weight basis and all measurements are made at 25°C. Material

[0081] The following materials were employed in the examples, listed alphabetically for ease of reference.

[0082] Base 1 is a silicone base prepared from: 68.7% PDMS1 defined below with a 25.8% surface area of ​​250 m 2 / g of calcined silica (Cab-O-Sil MS-75 from Cabot Corp., Tuscola, IL.), 5.4% hydroxyl-terminated diorganopolysiloxane with an average degree of polymerization (DP) of 8 and 0.02% ammonia.

[0083] Base 2 is a silicone base prepared from: 76.6% PDMS1 defined below, 17.6% surface area 250 m 2 / g of calcined silica, 5.7% of a hydroxyl-terminated diorganopolysiloxane with an average degree of polymerization (DP) of 8, and 0.02% of ammonia.

[0084] Base 3 was similar to Base 1 with only 5% calcined silica...

Embodiment A1-A17

[0109] Nylon 12-A (80.0 g) was dried at 120°C for two hours in a drying oven (i.e., a drying system in which hot air is passed through a drying bed to dry and then circulated in continuous flow through a heated oven containing the sample to be dried) . Then at 210°C, at 60rpm, in Haake System9000 TM The resin was melted in a miniaturized internal mixer (310 ml bowl) using a roller rotor under a dry nitrogen atmosphere. Will IRGANOX TM 1010 (0.24 g) was added and mixed for approximately 3.5 minutes and then Base 1 (120.0 g) was mixed in. After 3 minutes, X-LINKER1 (3.8 g) was added, at which point the mixer torque was approximately 1,800 m-g. After another 3.5 minutes, Catalyst 1 (57 drops = 0.855 g) was added and the torque started to rise sharply. After another seven minutes, the torque was increased to 16,400 m-g, mixing was stopped and the resulting nylon TPSiV sample was removed from the bowl.

[0110] Samples of the above materials were placed in stainless steel End...

Embodiment A18-A21

[0117] Nylon 12-A-based TPSiV was prepared according to the method of Example A1, wherein the total amount of base 1 and nylon 12-A was kept at 200 g, but the ratio of these two components, and IRGANOX TM 1010 content changes, as shown in Table A2. The amount of X-LINKER1 was also adjusted to maintain a constant SiH / Vi ratio. The respective mechanical properties are also shown in this table.

[0118] Example

IRGANOX TM

1010 content (g)

Base 1 pair nylon

12-A ratio

to stretch

(MPa)

Elongation

(%)

torque

(m-g)

Example A18

0.18

70 / 30

3.14

28

13,000

Comparative example A19

0.15

75 / 25

1.1

14

12,200

Example A20

0.12

80 / 20

2.85

64

10,000

Example A21

0.09

85 / 15

3.35

116

9,000

[0119] Use 1g of IRGANOX TM 1010 content, the above tes...

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PUM

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Abstract

A method for preparing a thermoplastic elastomer is disclosed, said method comprising (I) mixing(A) a rheologically stable polyamide resin having a melting point or glass transition temperature of 25° C. to 275° C.,(B) a silicone base comprising(B') 100 parts by weight of a diorganopolysiloxane gum having a plasticity of at least 30 and having an average of at least 2 alkenyl radicals in its molecule and(B'') 5 to 200 parts by weight of a reinforcing filler,the weight ratio of said silicone base to said polyamide resin is from 35:65 to 85:15,(C) 0.01 to 5 parts by weight of a stabilizer per 100 parts by weight of said polyamide resin plus said silicone base, said stabilizer being selected from hindered phenols; thioesters; hindered amines; 2,2'-(1,4-phenylene)bis(4H-3,1-benzoxazin-4-one); and 3,5-di-tert-butyl-4-hydroxybenzoic acid, hexadecyl ester,(D) an organohydrido silicon compound which contains an average of at least 2 silicon-bonded hydrogen groups in its molecule and(E) a hydrosilation catalyst,components (D) and (E) being present in an amount sufficient to cure said diorganopolysiloxane (B'); and(II) dynamically curing said diorganopolysiloxane (B'),wherein at least one property of the thermoplastic elastomer selected from tensile strength or elongation is at least 25% greater than the respective property for a corresponding simple blend wherein said diorganopolysiloxane is not cured and said thermoplastic elastomer has an elongation of at least 25%.

Description

field of invention [0001] The present invention relates to a thermoplastic elastomer composition in which a silicone base and hindered phenol are blended with a polyamide resin, and silicone gum contained in the base is dynamically vulcanized in the mixture. Background of the invention [0002] Thermoplastic elastomers (TPE) are polymeric materials that have properties of both plastic and rubber. They have elastomeric mechanical properties but, unlike conventional thermoset rubbers, they can be reprocessed at elevated temperatures. This processability is a major advantage that TPE has over chemically cross-linked rubbers, since it allows recycling of manufactured parts and results in a considerable reduction in scrap. [0003] In general, two main types of thermoplastic elastomers are known. Block copolymer thermoplastic elastomers comprise "hard" plastic segments with a melting point or glass transition temperature above ambient temperature and "sof...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08K5/13C08K5/541C08L77/00C08L83/04C08L83/07
CPCC08G77/12C08G77/20C08G77/44C08L83/04Y10S525/903C08L2666/14C08L2666/28C08L83/00
Inventor I·乔瓦斯M·李D·李中西康二李鎔晙R·L·奥丁斯基R·L·拉伯D·J·罗姆尼斯科J·P·塞奇
Owner DOW CORNING CORP
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