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Special PA6 injection molding material used for direct injection molding and preparation method thereof

A special material and direct technology, applied in the field of polymer engineering materials, can solve the problems of rising product cost, reduced mechanical properties, poor fluidity of PA6, etc., and achieve the effects of beautiful appearance, moderate process conditions and good fluidity

Active Publication Date: 2012-02-01
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technologies provided by the above patent documents have solved the problem of poor fluidity of PA6 from different angles, but there are still shortcomings
Chinese patent application CN101104735 proposes to add glass fiber to improve the mechanical properties of the material, resulting in a substantial increase in product costs
CN 101186108, JP 2001019846 proposed to add raw materials to improve the fluidity of materials. Although the fluidity of engineering materials is improved, the mechanical properties are reduced

Method used

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  • Special PA6 injection molding material used for direct injection molding and preparation method thereof
  • Special PA6 injection molding material used for direct injection molding and preparation method thereof
  • Special PA6 injection molding material used for direct injection molding and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1 and 2

[0032] Using PA6 as the base resin, using maleic anhydride grafted polyethylene glycol (MPEG) as the plasticizer, and using silane coupling agent to graft nano-SiO 2 As the enhancer, 3,5-di-tert-butyl-4-hydroxyphenylpropionyl-hexamethylenediamine (antioxidant 1098) and tris(2,4-di-tert-butylphenol) phosphite) (antioxidant Agent 168) is an antioxidant, and the mass ratio of antioxidant 1098 to antioxidant 168 is 1:1. The mix of materials is shown in Table 1.

[0033] Weigh and remove the silane coupling agent grafted nano-SiO 2 For other materials, mix them in the mixer for 3 to 5 minutes, and then feed the uniformly mixed materials into the twin-screw extruder, in which the silane coupling agent is grafted with nano-SiO 2 Add from the first exhaust port, the temperature from the feeding port to the extrusion die is 160-180°C, 190-220°C, 210-240°C, 220-250°C, 210-240°C, and the speed of the main engine is 30 ~40Hz, sample with plastic injection molding machine. The properti...

Embodiment 3 and 4

[0035] Add caprolactam monomer into the high-pressure reactor, and add various additives at the same time, including plasticizer maleic anhydride grafted polyethylene glycol (MPEG), reinforcing agent silane coupling agent grafted nano-SiO 2 , antioxidants, water and adipic acid. Antioxidant is antioxidant 1098 and antioxidant 168, and its mass ratio is 1:1. The mix of materials is shown in Table 3.

[0036] After feeding in the autoclave, the temperature is raised from room temperature to 200-210°C, the pressure reaches 0.8MPa, the hydrolysis ring-opening reaction is performed for 2 hours, and the temperature is raised to 250-260°C, the pressure is 0.6-0.7MPa, and the chain is extended for 2 hours. After the reaction is completed, the material is discharged in a water bath and granulated. The properties of the product materials are shown in Table 4.

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Abstract

The invention provides a special PA6 injection molding material used for direct injection molding and a preparation method thereof. The special PA6 injection molding material mainly comprises, by weight, 40 to 80% of nylon 6 resin, 10 to 25% of a plasticizer, 5 to 25% of a reinforcing agent and 0.2 to 5% of an anti-oxidant, wherein, the plasticizer is maleic anhydride grafted polyethylene glycol, the reinforcing agent is silane coupling agent grafted nanometer SiO2, and the anti-oxidant comprises (3,5-di-tert-butyl-4-hydroxyphenyl)propionyl-hexylenediamine and phosphite triester mixed according to a ratio of 0-1:0-1. The preparation method for the special PA6 injection molding material is to subject pure PA6 and auxiliary agents to melt blending or to add auxiliary agents into caprolactam monomers for polymerization in a manner of blending. Addition of auxiliary agents in PA6 resin enables the resin to have improved mechanical properties, surface smoothness, fluidity and aesthetic appearance and to meet requirements for high strength precision products.

Description

technical field [0001] The invention belongs to the technical field of polymer engineering materials, and in particular relates to a PA6 special material for direct injection molding. Background technique: [0002] PA6 (polycaprolactam) is an engineering material with excellent performance, which is used to produce engineering plastics. Engineering plastics made of PA6 injection molding special materials with PA6 as the main component are widely used in the production of automobile jamming and braking due to their good fluidity, excellent formability, excellent appearance and surface properties, and good mechanical properties. Various precision and complex parts such as oil cups, cable ties and low-voltage coil bobbins. In the modification process of nylon 6, as the amount of glass fiber reinforcement increases, the tensile strength and flexural modulus of engineering materials increase, and the shrinkage and warpage of processed products and components become smaller, but ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L71/08C08K13/06C08K9/06C08K3/36B29C47/92C08G69/16B29C48/92
Inventor 徐伟箭曹志广熊远钦王静卢彦兵霍建竹夏新年刘玺于建中张拉拉
Owner CHINA PETROLEUM & CHEM CORP
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