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Special material of high-strength flame-retardant reinforced nylon 6 and preparation method thereof

A special material and high-strength technology, which is applied in the field of high-strength flame-retardant reinforced nylon 6 special material and its preparation, can solve the problems of difficult diffusion of by-products, prolonged melt polycondensation time, solid-phase polymerization, and high viscosity of materials, and achieve good industrialization Application prospect, low raw material cost, good flame retardant effect

Active Publication Date: 2011-05-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of high-strength nylon 6 is generally to prolong the melting polycondensation time and solid-state polymerization. The former method has a high viscosity of the material in the later stage, which causes difficulty in the diffusion of by-products, and its slow reaction speed aggravates side reactions such as degradation, which leads to product performance. decline
The reaction speed of solid-state polymerization is slow, and large-scale production requires special equipment, thus limiting its application (Acta Polymer Sinica, 2004, 4)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the following mass content, the flame retardant compounded by ammonium tripolyphosphate and melamine (3:1) with a degree of polymerization of 1000: 15%; glass fiber: 25%; nylon 6 resin: 58%; tricresyl phosphate: 1%; Butyl isocyanate: 1%. Mix in a high-speed mixer for 10 minutes, then feed the mixture into a twin-screw extruder, mix, extrude and cut into pellets in the twin-screw extruder, and the temperature of the barrel is controlled at 210°C.

[0021] The properties of the flame-retardant glass fiber-reinforced nylon 6 special material prepared above are measured: vertical combustion V-0 grade, tensile strength 112.2MPa, bending strength 205.1MPa, impact strength 10.4Kj / m 2 . At 240°C and shear rate 86.2s -1 , the shear viscosity of its melt reaches 100Pa·s.

Embodiment 2

[0023] The flame retardant compounded by ammonium dipolyphosphate and melamine (3:1) with a polymerization degree of 1500 according to the mass content in the following example: 15%, glass fiber: 25%; nylon 6 resin: 59%; tributylbenzene phosphate Esters: 1%. Mix in a high-speed mixer for 10 minutes, then feed the mixture into a twin-screw extruder, mix, extrude and cut into pellets in the twin-screw extruder, and the temperature of the barrel is controlled at 210°C.

[0024] The properties of the flame-retardant glass fiber-reinforced nylon 6 special material prepared above are measured: vertical combustion V-0 grade, tensile strength 110.9MPa, bending strength 206.5MPa, impact strength 10.5Kj / m 2 , at 240°C and a shear rate of 89.2s -1 , the shear viscosity of its melt reaches 100Pa·s.

Embodiment 3

[0026] The flame retardant compounded by ammonium tetrapolyphosphate and melamine composite flame retardant (3:1) with a degree of polymerization of 2000 according to the mass content in the following example: 15%, glass fiber: 25%; nylon 6 resin: 57% ; Methyl isocyanate: 3%, mixed in a high-speed mixer for 10 minutes, then the mixture was added to a twin-screw extruder, mixed and extruded into pellets in the twin-screw extruder, and the temperature of the barrel was controlled at 210°C.

[0027] The properties of the flame-retardant glass fiber-reinforced nylon 6 special material prepared above are measured: vertical combustion V-1 grade, tensile strength 115.0MPa, bending strength 207.3MPa, impact strength 11.6Kj / m 2 , at 240°C and a shear rate of 96.4s -1 , the shear viscosity of its melt reaches 100Pa·s.

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Abstract

The invention discloses a special material of high-strength flame-retardant reinforced nylon 6 and a preparation method thereof, wherein the special material is prepared by reaction of nylon 6 resin, fiber glass, flame retardant and chain extender through a double-screw extruder; and the mass ratio of the components is as follows: 55 to 59 percent of nylon 6 resin, 25 percent of fiber glass, 15 percent of flame retardant and 1 to 5 percent of chain extender, wherein the flame retardant is a mixture of ammonium polyphosphate and tripolycyanamide; and the chain extender is one or a mixture of two of organic phosphate, isocyanate, bis(oxazoline). Compared with the prior art, the special material of high-strength flame-retardant reinforced nylon 6 is characterized by good flame retardant property, excellent mechanical property, low cost of raw material, good chain extending effect and the like, and has good industrial application prospect.

Description

(1) Technical field [0001] The invention relates to a high-strength flame-retardant reinforced nylon 6 special material and a preparation method thereof. (2) Background technology [0002] Nylon 6, commonly known as polyamide, as the largest engineering plastic, has the advantages of high strength, wear resistance, oil resistance and chemical corrosion resistance, so it is widely used in automobile manufacturing, aerospace, electrical and electronic and mechanical equipment and other fields. However, nylon 6 has disadvantages such as poor low-temperature toughness and easy water absorption, which limits its application (Engineering Plastics Application, 1999, 27). Therefore, it is urgent to develop high-strength nylon 6. The preparation of high-strength nylon 6 is generally to prolong the melting polycondensation time and solid-state polymerization. The former method has a high viscosity of the material in the later stage, which causes difficulty in the diffusion of by-prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/02C08K3/32C08K5/3492C08K7/14C08K5/523C08K5/29C08K5/353
Inventor 王旭陈思瞿英俊
Owner ZHEJIANG UNIV OF TECH
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