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High heat resistance and low warping nylon 66 composite and preparation method thereof

A composite material and nylon technology, which is applied in the field of high heat resistance and low warpage nylon 66 composite material and its preparation, can solve the problem of poor long-term heat resistance effect of antioxidant system, warping deformation of parts, and reduce long-term heat resistance of nylon 66 composite material. performance and other issues, to achieve the effects of excellent long-term thermal oxygen aging performance, good interface bonding performance, and excellent dimensional stability

Active Publication Date: 2013-04-10
SHANGHAI KINGFA SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nylon 66 can greatly improve its mechanical properties, heat resistance temperature and wear resistance after being modified by glass fiber reinforcement. It is easy to produce orientation, which will cause the melt to warp and deform in the flow direction and vertical flow direction due to inconsistent shrinkage. For parts with large surface area, it is difficult to control the flatness of the parts
[0004] Patent CN 1970629A discloses a resin and mica composite filling reinforcement material, with nylon or PBT as the base material, adding glass fiber, coupling agent, antioxidant, lubricant, etc. The addition of mica can improve the warpage deformation effect of the material , but due to the relatively poor long-term heat resistance effect of the antioxidant system used, it is not suitable for the use requirements of the peripheral parts of the engine
Patent CN101205362A has prepared a composite reinforced nylon 66 resistant to warping and deformation. In this patent, PP-g-MAH is used as a compatibilizer. The introduction of this compatibilizer will affect the thermal deformation temperature of the nylon 66 composite material, and at the same time It is easy to reduce the long-term heat resistance of nylon 66 composites

Method used

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  • High heat resistance and low warping nylon 66 composite and preparation method thereof
  • High heat resistance and low warping nylon 66 composite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Add 10 parts by weight of wollastonite with a particle size of 10 μm into a high-speed mixer preheated to 40°C, add 0.1 parts by weight of coupling agent KH550, and mix with a high-speed mixer to obtain surface-activated silica fume Stone, add 1# measuring scale;

[0036] (2) 79.6 parts by weight of pre-dried nylon 66 (relative viscosity 3.2), 0.1 part by weight of copper salt composite heat stabilizer (H3336, purchased from Bruggemann), 0.1 part by weight of talcum powder with a particle size of 1 μm Mix with 0.1 parts by weight of silicone masterbatch (MB50-002, purchased from Dow Corning Company) through a high-speed mixer to obtain pre-mixed raw materials, and add 2# weighing scale;

[0037] (3) The material measured by the 1# and 2# weighing scales is fed through the main feeder of the twin-screw extruder, and 10 parts by weight of alkali-free chopped glass fiber (10 μm in diameter of the monofilament, ECS301CL, purchased from Chongqing CPIC Company ) is measu...

Embodiment 2

[0039] (1) Add 10 parts by weight of kaolin with a particle size of 10 μm into a high-speed mixer preheated to 40°C, add 0.1 parts by weight of coupling agent KH550, 0.1 parts by weight of stearic acid, and 0.1 parts by weight of maleic anhydride, and use Mix with a high-speed mixer to obtain surface-activated kaolin, add 1# weighing scale;

[0040] (2) 78.6 parts by weight of pre-dried nylon 66 (relative viscosity 2.7), 0.1 part by weight of copper salt composite heat stabilizer (H3336, purchased from Bruggemann), 0.1 part by weight of antioxidant 1011, 0.3 Parts by weight of particle size are talc powder of 1 μm, 0.3 parts by weight of montanic acid ester, and 0.3 parts by weight of polyol ester (PETS, purchased from Lonza Corporation of the United States) are added in a high-speed mixer and mixed uniformly to obtain pre-mixed raw materials. Add 2# measuring scale;

[0041](3) The material measured by the 1# and 2# weighing scales is fed through the main feeder of the twin-...

Embodiment 3

[0043] (1) Add 20 parts by weight of wollastonite with a particle size of 10 μm into a high-speed mixer preheated to 50°C, add 0.2 parts by weight of coupling agent KH550, 0.2 parts by weight of stearic acid, and 0.2 parts by weight of maleic anhydride , mix with a high-speed mixer to obtain surface-activated wollastonite, and add 1# weighing scale;

[0044] (2) 67.6 parts by weight of pre-dried nylon 66 (relative viscosity 2.7), 0.3 parts by weight of antioxidant 1098, 0.3 parts by weight of antioxidant 168, 0.3 parts by weight of montmorillonite with a particle size of 1 μm, 0.3 parts by weight of The montanic acid ester of 0.3 weight part, the polyol ester (PETS, purchased from U.S. Lonza Company) of 0.3 weight part and the silicone masterbatch (MB50-002, purchased from Dow Corning Company) of 0.3 weight part) add in the high-speed mixer and mix homogeneously After that, add 2# measuring scale;

[0045] (3) The material measured by the 1# and 2# weighing scales is fed thro...

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Abstract

The invention provides a high heat resistance and low warping nylon 66 composite and a preparation method thereof. The nylon 66 composite is characterized in that the composite comprises the following raw materials in parts by weight: 41.9-79.6 parts of nylon resin, 10-30 parts of chopped glass fiber, 10-25 parts of mineral filler, 0.1-0.9 parts of surface conditioning agent, 0.1-0.6 parts of nucleator, 0.1-0.6 parts of heat stabilizer, and 0.1-1 part of lubricant, wherein the nylon resin is nylon 66 of which the relative viscosity [eta] is 2.4-3.2 (Ubbelohde viscosimetry). According to the high heat resistance and low warping nylon 66 composite, the glass fiber and mineral powder are composited and filled, and aids such as the heat stabilizer, the nucleator and the lubricant are added. The glass fiber and the mineral powder subjected to surface treatment have a good interface bonding property with the nylon 66 resin. The prepared nylon composite has excellent dimensional stability, good mechanical property, and excellent long-term thermo-oxidative aging resistance, and can be widely applied to the fields of peripheral parts of an automobile engine, electric products and the like.

Description

technical field [0001] The invention relates to a nylon 66 composite material with high heat resistance and low warpage and a preparation method thereof, which is mainly used in the manufacture of auto parts such as engine covers and valve chamber covers, and belongs to the technical field of modified polyamides. Background technique [0002] Nylon 66 (PA66) has a strong polar amide group (-CONH-) in its molecular chain, and the hydrogen bond formed between the groups makes the structure of PA66 easy to crystallize, so that the material has excellent mechanical properties and is naturally Lubricity, wide operating temperature, good electrical insulation, oil resistance, good chemical stability, easy processing, etc., so it is widely used in various fields of national economy, such as auto parts, high-speed railway fasteners, gears, automatic printers Various high-load mechanical parts such as cams. Nylon 66 can greatly improve its mechanical properties, heat resistance temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08K13/06C08K9/06C08K9/04C08K7/14C08K3/34B29B9/06
Inventor 丁正亚李志路肖军华冯德才
Owner SHANGHAI KINGFA SCI & TECH
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