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High temperature resistant and dimensionally stable modified material for engine and preparation method thereof

A dimensionally stable and modified material technology, applied in the field of polymer materials, can solve the problems of high temperature thermal oxidation resistance of glass fiber reinforced nylon materials that need to be improved, difficulty in ensuring the sealing of the engine cover, and inconsistent shrinkage of the engine cover. Achieve the effects of improving dimensional stability and surface gloss, improving heat aging resistance and shortening molding cycle

Active Publication Date: 2022-04-08
宁波普立隆高分子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Glass fiber reinforced modified nylon has high mechanical properties and heat resistance, and has gradually become the main material for making engine covers. However, after glass fiber reinforcement, the surface of the product is prone to glass fiber exposure. Uneven distribution and orientation of glass fibers leads to warpage and deformation of the engine cover due to inconsistent shrinkage in the melt flow direction and vertical direction, and insufficient dimensional stability seriously affects the use of the engine cover, and it is difficult to ensure the sealing of the engine cover
In addition, with the gradual miniaturization of the engine, the use of turbo to increase the intake air volume of the engine instead of natural suction, although the power of the engine increases, the temperature of the surrounding environment rises significantly, which can reach more than 200 ° C, which forces the use of The high temperature resistance level of the cover material is continuously improved, and the glass fiber reinforced modified nylon can only be used in some occasions that do not require high long-term heat resistance and stability. If exposed to high temperature for a long time, its mechanical properties will deteriorate rapidly due to thermal oxygen aging. decline,
[0004] In view of the related technologies mentioned above, the inventor believes that due to the orientation of the fibers, the glass fiber reinforced nylon material is prone to warping when preparing the engine cover, and the dimensional stability is poor. The high temperature thermal oxidation resistance of fiber reinforced nylon materials needs to be improved

Method used

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  • High temperature resistant and dimensionally stable modified material for engine and preparation method thereof
  • High temperature resistant and dimensionally stable modified material for engine and preparation method thereof
  • High temperature resistant and dimensionally stable modified material for engine and preparation method thereof

Examples

Experimental program
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Effect test

preparation example 1-6

[0041] In Preparation Example 1-6, the polyoxymethylene was selected from Shanghai Fuchen Plastic Materials Co., Ltd., and the model was TR-10D; the nylon fiber was selected from Shenzhen Tellus New Material Technology Co., Ltd., with a diameter of 20D and a length of 1 mm; montmorillonite was selected from Lingshou County Hengchang Mineral Products Processing Plant, the model is J-009.

preparation example 1

[0042] Preparation Example 1: (1) Mix 1kg of montmorillonite with 0.7kg of cetyl dimethyl ammonium bromide and 3kg of distilled water, heat to 60°C, stir evenly, filter with suction, wash with deionized water at 60°C Under vacuum drying for 4h, organic montmorillonite was obtained;

[0043] (2) Immerse 4kg of nylon fibers in a sodium hydroxide solution with a concentration of 75%, and after mixing evenly, place for 24 hours, wash with distilled water to pH 7, dry at 100 ° C to a moisture content of 3%, add 0.8kg concentration 2g / L dopamine tris(hydroxymethyl)aminomethane solution, mixed, stirred at 0.6MPa for 1h, and dried at 100°C to a moisture content of 3%;

[0044] (3) 5kg polyoxymethylene, the obtained product of step (1) and the obtained product of step (2) were melt-blended at 190°C, extruded, granulated, and dried.

preparation example 2

[0045] Preparation Example 2: (1) Mix 1.5 kg of montmorillonite with 1 kg of cetyl dimethyl ammonium bromide and 4 kg of distilled water, heat to 65°C, stir evenly, filter with suction, wash with deionized water at 60°C Under vacuum drying for 4h, organic montmorillonite was obtained;

[0046] (2) Immerse 4.5kg of nylon fibers in a sodium hydroxide solution with a concentration of 80%, mix them evenly, place them for 24 hours, wash with distilled water to a pH of 7.5, dry at 103°C to a moisture content of 4%, add 0.9kg Dopamine tris(hydroxymethyl)aminomethane solution with a concentration of 3g / L was mixed, stirred at 0.8MPa for 0.8h, and dried at 103°C to a moisture content of 4%;

[0047] (3) 6kg of polyoxymethylene, the obtained product of step (1) and the obtained product of step (2) were melt-blended at 220°C, extruded, granulated, and dried.

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Abstract

The application relates to the field of polymer materials, and specifically discloses a high-temperature resistant and dimensionally stable modified material for engines and a preparation method thereof. The high-temperature-resistant and dimensionally stable modified material for the engine includes the following components by weight: 60-70 parts of polyamide 66, 30-33 parts of chopped glass fiber, 1-2 parts of heat-resistant agent, and anti-warping agent 1-5 parts, 0.3-0.5 parts of antioxidant, 0.5-1 part of lubricant, 0.2-0.4 parts of nucleating agent; the preparation method is: S1, weighing; S2, mixing; S3, extrusion granulation. The high-temperature resistant and dimensionally stable modified material for engines of the present application has the advantages of high dimensional stability and thermal deformation temperature, small warpage and deformation, and good noise reduction effect.

Description

technical field [0001] The present application relates to the field of polymer materials, more particularly, it relates to a high temperature resistant and dimensionally stable modified material for an engine and a preparation method thereof. Background technique [0002] The quality of the automobile engine directly affects the quality of the automobile products. The engine cover is the largest plastic part on the automobile engine. Polyamide has the characteristics of high strength, chemical resistance and good processability. The application of the automobile engine cover have been greatly developed. [0003] Glass fiber reinforced modified nylon has high mechanical properties and heat resistance, and has gradually become the main material for the preparation of engine covers. The uneven distribution and orientation of the glass fiber causes the engine cover to have inconsistent shrinkage rates in the melt flow direction and the vertical direction, resulting in warping d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/06C08L59/00C08L77/00C08L27/18C08L71/12C08K7/14C08K9/04C08K3/34C08K3/22C08K7/06C08K9/02C08K13/06
CPCC08L77/06C08K2003/2213C08L2201/08C08L2205/035C08L59/00C08L77/00C08L27/18C08L71/12C08K7/14C08K9/04C08K3/34C08K3/22C08K7/06C08K9/02C08K9/08C08K13/06
Inventor 李延辉张电丰杨万银秦占伟
Owner 宁波普立隆高分子材料有限公司