Halogen-free flame-retardant PA6 and preparation method thereof

A flame retardant, nitrogen-based flame retardant technology, applied in the field of halogen-free flame retardant PA6, can solve the problems of poor compatibility between the flame retardant and the substrate, affecting the mechanical properties of the material, and large amount of addition, so as to improve fire safety. , reduce adverse effects, reduce the effect of adding

Active Publication Date: 2020-08-25
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most studies use flame retardants containing single flame retardant groups to add to PA6, but often need to add a large amount to meet the flame retardant requirements
Therefore, there will be problems such as poor compatibility between the flame retardant and the matrix, and uneven mixing, which greatly affects the mechanical properties of the material.

Method used

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  • Halogen-free flame-retardant PA6 and preparation method thereof
  • Halogen-free flame-retardant PA6 and preparation method thereof
  • Halogen-free flame-retardant PA6 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, the compound halogen-free flame retardant with a weight fraction of 8.00% (a mixture of aluminum hypophosphite and cyclotetrasiloxane at a mass ratio of 2.6:1 to melamine cyanurate at a mass ratio of 3:1), 0.15% of the main Antioxidant 1010, 0.3% auxiliary antioxidant 1098, 1.55% lubricant polyethylene wax and 90% PA6 are compounded, then mixed evenly in a high-speed mixer, and vacuum-dried at 100°C. It is pulverized by a pulverizer, melted and extruded in a twin-screw extruder, cooled and pelletized to obtain a halogen-free flame-retardant PA6 composite material. And measured its limiting oxygen index LOI, vertical burning UL-94 grade, tensile strength and notched impact strength and other data, as shown in Table 2.

[0027] Table 1

[0028]

[0029] Table 2

[0030]

Embodiment 2

[0032] In this example, the weight fraction is 8.00% halogen-free flame retardant (mass ratio of aluminum hypophosphite-cyclotetrasiloxane dibase compound to melamine cyanurate 3:1), 0.15% of the main antioxidant 1076, 0.3 % auxiliary antioxidant 168, 1.55% lubricant white oil and 90% PA6 are compounded, then mixed evenly in a high-speed mixer, dried in vacuum at 100 ° C, pulverized by a pulverizer, and then Melt extrusion in a twin-screw extruder, cool and pelletize to obtain a halogen-free flame-retardant PA6 composite material. And measured its limiting oxygen index LOI, vertical burning UL-94 grade, tensile strength and notched impact strength and other data, as shown in Table 2.

Embodiment 3

[0034] In this example, the weight fraction is 12.00% compound halogen-free flame retardant (mass ratio of nickel hypophosphite-cyclotetrasiloxane dibase compound to ammonium polyphosphate 4:1), 0.3% of the main antioxidant 1076, 0.6 % auxiliary antioxidant 1098, 2% lubricant polyethylene wax and 85.10% PA6 are compounded, then mixed evenly in a high-speed mixer, vacuum dried at 100°C, and then extruded in a twin-screw extruder Melt extrusion, cooling and pelletizing to obtain halogen-free flame-retardant PA6 composite material. And measured its limiting oxygen index LOI, vertical burning UL-94 grade, tensile strength and notched impact strength and other data, as shown in Table 2.

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PUM

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Abstract

The invention relates to a halogen-free flame-retardant PA6 composite material which comprises the following components in percentage by mass: 66%-90% of a PA6 base material, 9%-25% of a compound halogen-free flame retardant, 0.1%-2.0% of a main antioxidant, 0.2%-4.0% of an auxiliary antioxidant and 0.7%-3.0% of a lubricant, wherein the compound halogen-free flame retardant is prepared from a hypophosphite-cyclotetrasiloxane double-base synergistic compound and a nitrogen flame retardant together. Hypophosphite-cyclotetrasiloxane double groups are used for cooperation, the flame retardant hasextremely good charring performance and an excellent flame retardant effect, the addition amount of the halogen-free flame retardant can be greatly reduced, the compatibility problem of the flame retardant and a matrix is improved, and the mechanical property of the matrix can be enhanced due to the existence of a Si crosslinking structure contained in a siloxane group so that adverse effects caused by the addition of the flame retardant are further counteracted; the halogen-free flame-retardant PA6 composite material has the advantages of high flame-retardant efficiency, no halogen, low smoke, low toxicity, dripping resistance and excellent processability and is widely applicable.

Description

technical field [0001] The invention relates to a halogen-free flame-retardant PA6, which belongs to the technical field of adding a specific flame-retardant component to PA6 to obtain a flame-retardant PA6 composite material. Background technique [0002] Polyamide 6 (PA6) is widely used in electronics and electrical, instrumentation, transportation, construction and other fields due to its excellent physical and mechanical properties, oil resistance, wear resistance and self-lubricating properties. Since PA6 itself is easy to burn, it is difficult to form charcoal, and it drips continuously when burning, which is easy to spread the flame and cause a fire. Therefore, in order to meet the product's requirements for the flame retardancy of polymer materials, it is necessary to effectively modify PA6. . Adding flame retardants to PA6 is a common method to change the flammability of PA6. [0003] The flame retardants currently used in PA6 mainly include halogen flame retardan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L23/06C08L91/00C08L91/06C08K13/02C08K3/32C08K5/549C08K5/3492C08K5/134C08K5/20C08K5/526
CPCC08L77/02C08L2201/02C08L2201/22C08K2003/323C08L23/06C08K13/02C08K3/32C08K5/549C08K5/34928C08K5/1345C08K5/20C08L91/00C08K5/526C08L91/06
Inventor 许博邵路山许准郭芳钱立军
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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