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Low-moisture-absorption long-term heat-resistant aging-resistant polyamide composition and preparation method thereof

A polyamide composition and heat-resistant aging technology, which is applied in the field of low-moisture-absorbing long-term heat-resistant aging polyamide composition and its preparation, can solve the problems of decreased mechanical properties of the matrix, cost, and lower material water absorption, and achieve heat-resistant aging Excellent performance, high gas barrier performance, effects of protecting aging resistance

Inactive Publication Date: 2015-05-06
SHANGHAI SUNNY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is also reported that metal Fe and its oxides can effectively improve its aging resistance at higher temperatures, but it may cause a decrease in the mechanical properties of the matrix, and the stability of the processing process is not easy to control
[0004] Chinese patent CN 1513913A discloses a nylon composition and its preparation method. The water absorption rate of the material is reduced by adding polyethylene to the nylon matrix, but it has a great influence on the mechanical properties
[0005] Chinese patent CN 101115786A discloses a heat-resistant aging polyamide material, which uses PEI and copper chloride to improve the aging resistance, but it is not easy to obtain and expensive, and cannot improve the heat-resistant oil aging properties of nylon

Method used

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  • Low-moisture-absorption long-term heat-resistant aging-resistant polyamide composition and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1-8

[0029] A low moisture absorption long-term heat-resistant aging polyamide composition and a preparation method thereof, comprising the following steps:

[0030] (1) Prepare materials according to the components and contents in Table 1.

[0031] Among them, the thermoplastic limited amine A1 is PA66, which is selected from PA66EPR2.7 of Shenma Group, and the content of terminal amino group is 46meq / Kg;

[0032] Thermoplastic limited amine A2 is PA6 / 66 copolymer, selected from Radici PA66 45C00H;

[0033] Aromatic polyamide B1 is PA6I, is selected from T40 of Bayer Company;

[0034] Aromatic polyamide B2 is PA6T / 6I copolymer, the ratio of PA6T:PA6I is 30:70;

[0035] The glass fiber is short glass fiber, which is 3360 of PPG company;

[0036] The barrier agent is ethylene-vinyl alcohol copolymer, with an ethylene content of 20-45%, which can be F171 from Kuraray;

[0037] The thermal aging aid is copper halide, preferably CuI, which can be 3320 of Langte Industrial Company; ...

Embodiment 8

[0039] "Other additives" in Example 8 are glass microspheres, treated with a silane coupling agent, which can be the brand name K1 of 3M Company.

[0040] (2) Put the above-mentioned raw materials except glass fiber into the high mixer and mix for 3-5 minutes, then discharge to obtain the mixture, and then control the processing temperature of the twin-screw extruder at 230-280°C, and the screw rotation speed at 180-600 rpm / min, the mixture is placed in a twin-screw extruder, the glass fiber enters from the glass fiber port, extruded and granulated, and the product is obtained

[0041] Table 1

[0042]

[0043] Samples 1-8 prepared according to Examples 1-8 were compared in performance tests using ISO standards. The aging test was carried out in a hot air aging box at 200°C, and the engine oil was selected from automotive transmission oil. The test performance comparisons are shown in Table 2.

[0044] Table 2

[0045]

Embodiment 9

[0047] A polyamide composition with low moisture absorption and long-term heat-resistant aging is prepared by using the following components and raw materials in weight percentage:

[0048] 20% of thermoplastic polyamide resin, 30% of semi-aromatic polyamide resin, 15% of glass fiber, 10% of barrier agent, 0.1% of thermal aging additive, and 24.9% of other additives. Among them, thermoplastic polyamide resin adopts a part of PA612 resin One or several kinds of copolymers, the amino-terminal content of the thermoplastic polyamide resin is at least 50meq / kg, and the semi-aromatic polyamide resin is obtained by polymerization of aliphatic dicarboxylic acid containing aromatic diamine and 8-20 carbon atoms A kind of polyamide or copolymer made, PAMXD6 is used in this embodiment, the glass fiber is the alkali-free glass fiber whose surface is treated with silane coupling agent, the diameter is 5μm, and the barrier agent is the copolymer of vinyl alcohol and ethylene, wherein ethylen...

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Abstract

The invention relates to a low-moisture-absorption long-term heat-resistant aging-resistant polyamide composition and a preparation method thereof. The polyamide composition is prepared from the following raw materials in percentages by weight: 20-55% of thermoplastic polyamide resin, 5-30% of semi-aromatic polyamide resin, 15-60% of glass fiber, 1-10% of a blocker, 0.1-1% of a thermal aging additive and 0.1-30% of other additives. Compared with the prior art, the semi-aromatic polymer is added into the composite system, the moisture-absorption property of a matrix can be significantly decreased due to the high steric-hindrance effect of the composite system; in addition, because of the presence of benzene rings, characteristics of good barrier property and heat resistance and retention are achieved and the polyamide composition also has the advantages of low moisture absorption, very excellent mechanical strength, heat resistance, aging resistance and the like.

Description

technical field [0001] The invention relates to the field of polyamide compositions with improved long-term high-temperature stability, in particular to a low moisture absorption long-term heat-resistant aging polyamide composition and a preparation method thereof. Background technique [0002] Polyamide has ideal chemical resistance, processability and heat resistance, and is the first of the five engineering plastics, among which PA66 and PA6 are the most widely used. However, due to the existence of a large number of amide groups and the low steric hindrance effect, unmodified PA66 or PA6 is easy to "absorb water" by hydrogen bonding with water, and the mechanical properties of nylon decrease significantly after water absorption. At the same time, in the automotive or electronic and electrical fields, such as automotive engine peripherals, fuel systems or hot electronic components, these parts have to work in a hot working environment for a long time, and the long-term co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L77/06C08L29/04C08K9/06C08K7/14C08K3/16
CPCC08K7/14C08K7/20C08K9/06C08L77/00C08L77/06C08L2201/08C08L2201/14C08L2205/02C08L2205/025C08L2205/03
Inventor 张强陈光伟周军杰周晓兵孟成铭
Owner SHANGHAI SUNNY
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