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High-retardant polyamide

A polyamide, high flame retardant technology, applied in the field of flame retardant polyamide, can solve the problems of no test data of flame retardant effect, complicated preparation process of flame retardant, and unfavorable expansion of production, etc., so as to solve the problem of wick effect, Excellent flame retardant effect, excellent flame retardancy and mechanical properties

Active Publication Date: 2012-01-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from its examples that when only the flame retardant is simply added, the material can only pass the 1 / 16 inch V-0 grade, and no conventional flame retardant effect description is given - the oxygen index test data
At the same time, the preparation process of the flame retardant is complicated, and the cost of the obtained material is relatively high, which is not conducive to expanding production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First, 85 parts of polyamide 6, 14 parts of monoisobutylaluminum phosphinate, and 1 part of boehmite were dried at 100°C for 8 hours under vacuum, then pre-mixed and melted at 230°C in a twin-screw extruder Blending, extruding, granulating, and drying to obtain highly flame-retardant polyamide.

[0029] The oxygen index of the highly flame-retardant polyamide is 27.3%, the UL-94 vertical burning rating of the 1.6 mm thick sample is V-0, and the 0.8 mm thick sample UL-94 vertical burning rating is NR.

Embodiment 2

[0031] First, 84 parts of polyamide 6, 10 parts of aluminum monoisobutylphosphinate, 5 parts of melamine pyrophosphate, and 1 part of boehmite were dried at 100°C for 8 hours under vacuum, and then pre-mixed evenly and extruded by twin-screw. Melt and blend at 230°C in the discharge machine, extrude, granulate, and dry to obtain high flame-retardant polyamide.

[0032]The oxygen index of the highly flame-retardant polyamide is 28.1%, the UL-94 vertical burning rating of the 1.6 mm thick sample is V-0, and the 0.8 mm thick sample UL-94 vertical burning rating is V-2.

Embodiment 3

[0034] Dry 74.5 parts of polyamide 6, 12 parts of aluminum diisobutylphosphinate, 3 parts of melamine polyphosphate, 0.5 parts of boehmite, and 10 parts of alkali-free glass fiber at 100°C for 8 hours under vacuum, and then pre- After mixing evenly, melt and blend in a twin-screw extruder at 245°C, extrude, granulate, and dry to obtain a highly flame-retardant polyamide.

[0035] The oxygen index of the highly flame-retardant polyamide is 30.4%, the UL-94 vertical burning rating of the 1.6 mm thick sample is V-0, and the 0.8 mm thick sample UL-94 vertical burning rating is V-1.

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Abstract

The invention discloses high-retardant polyamide which is prepared from the following components in percentage by weight through cross blending fusion: 42-85% of polyamide, 10-25% of branched chain alkyl phosphinic acid and melamine derivatives, 0.5-3% of fire-retardant synergist, and 0-30% of alkali-free glass fiber, wherein the mass ratio in percentage of branched chain alkyl phosphinic acid tothe melamine derivatives is (2:1)-(4:1), or the mass percentage of the melamine derivatives is 0, the oxygen index of the high-retardant polyamide is 27.3-32.2%, and the vertical flame UL-94 of a test sample with the thickness of 1.6mm is V-1, and the vertical flame UL-94 of a test sample with the thickness of 0.8mm is NR-(V-0). The high-retardant polyamide provided by the invention is obtained through adding a retardant system of a novel branched chain alkyl phosphinic acid fire retardant, a nitrogen or phosphorous compound and the formulation of the synergist, not only has an excellent fireretardant effect, but also can be used for lowering the cost through reducing the additive amount of the fire retardant.

Description

technical field [0001] The invention belongs to the technical field of flame-retardant polyamides, in particular to a highly flame-retardant polyamide mainly based on a branched chain alkyl phosphinate compounded with a nitrogen-containing flame retardant or a glass fiber-reinforced high flame-retardant polyamide. amides. Background technique [0002] Polyamide is commonly known as nylon (Nylon), the English name is Polyamide (PA), and polyamide 6 and polyamide 66 are two of the most important varieties. Although polyamide has become the material of choice for the electrical and electronic industry and the automotive industry due to its good mechanical properties, chemical resistance, oil resistance and good electrical insulation, but because these fields now require high flame retardancy properties of materials, The flame retardancy of polyamide and its glass fiber-reinforced polyamide products is very poor, and its oxygen index is only 22%. Even if the thickness of polyam...

Claims

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Application Information

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IPC IPC(8): C08L77/00C08K13/04C08K7/14C08K5/5313C08K5/3492C08L77/02C08L77/06
Inventor 赵斌陈力王玉忠胡志龙家伟邵明峰
Owner SICHUAN UNIV
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