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Flame-retardant smoke-suppressing enhanced polylactic acid composite fiber and preparation method thereof

A composite fiber and polylactic acid technology, which is applied in the manufacture of fire-retardant and flame-retardant filaments, single-component polyester rayon, etc., to avoid the phenomenon of melting droplets, good mechanical strength, and good performance.

Inactive Publication Date: 2018-07-31
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a flame-retardant and smoke-suppressing enhanced polylactic acid composite fiber for the problem that the existing polylactic acid composite fiber is prone to produce a large amount of toxic smoke in case of fire due to the use of a large amount of phosphorus-containing flame retardants. Composite fiber and its preparation method, the polylactic acid composite fiber is difficult to ignite in a butane gas flame under standard air conditions, and occasionally it will self-extinguish after being ignited, without obvious droplet phenomenon, and does not cause cotton below chip fire phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] Preparation of control samples

[0032] Take a certain amount of melamine polyphosphate, microcrystalline cellulose and polylactic acid resin and dry them in an oven at 120±5°C for 24 hours. Weigh 7.0kg of dry polylactic acid resin and 2.0kg of dry melamine polyphosphate, 1.0kg of microcrystalline cellulose is placed in a high-speed mixer for stirring and blending, and then injected into a multistage heating twin-screw extruder for melt blending , Extrusion, granulation, drying, the extrusion temperature is 180°C. In the obtained composite polylactic acid pellets, the mass percentage of melamine polyphosphate is about 20%. The obtained composite polylactic acid masterbatch is mixed with polylactic acid resin at a ratio of 50 / 50, and the continuous composite flame-retardant fiber is obtained by spinning, drawing and winding on a melt spinning machine. Among them, the hot drawing temperature was 80°C.

[0033] The performance of the comparison samples

[0034] Weaving...

Embodiment 1

[0041] This embodiment provides a flame-retardant and smoke-suppressing enhanced polylactic acid composite fiber and a preparation method thereof.

[0042] Polylactic acid composite fiber

[0043] The polylactic acid composite fiber is composed of organic boron nitrogen flame retardant, flame retardant synergist and polylactic acid resin.

[0044] Specifically, the organic boron-nitrogen flame retardant is characterized in that its molecular weight is 160-100,000, and its molecular structure contains nitrogen atoms, boron atoms and benzene rings, wherein the boron atoms and benzene rings are directly linked by covalent bonds, and The number of boron atoms is smaller than that of nitrogen atoms. The mass percent content of the organoboron nitrogen flame retardant can be any value less than or equal to 7.5%. The flame retardant synergist includes natural polymers and phosphorus-containing compounds, wherein the natural polymers are selected from any one of cellulose, lignin an...

Embodiment 2

[0070] This embodiment provides a flame-retardant and smoke-suppressing enhanced polylactic acid composite fiber and a preparation method thereof.

[0071] Polylactic acid composite fiber

[0072] The difference between the polylactic acid composite fiber provided in this example and Example 1 is that the organoboron nitrogen flame retardant is p-phenylboronic acid (molecular weight 3420, boron content 2.4%) grafted with polyethylenimine. The flame retardant synergist is a mixture of lignin and ammonium polyphosphate. In other words, the polylactic acid composite fiber provided in this example is composed of p-phenylboronic acid grafted with polyethylenimine, lignin, ammonium polyphosphate and polylactic acid resin, wherein the polyethyleneimine The mass percentage of grafted p-phenylboronic acid is about 6.75%.

[0073] Preparation of polylactic acid composite fibers

[0074] S1) Use a certain amount of organic boron nitrogen flame retardant, flame retardant synergist and ...

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Abstract

The invention discloses a flame-retardant smoke-suppressing enhanced polylactic acid composite fiber and a preparation method thereof. The polylactic acid composite fiber comprises the following threecomponents: an organic boron-nitrogen flame retardant, a flame retardant synergist and polylactic acid resin. The preparation method comprises the following steps: S1) preparing composite polylacticacid masterbatch from a certain amount of the organic boron-nitrogen flame retardant, the flame retardant synergist and the polylactic acid resin; and S2) preparing the polylactic acid composite fiberfrom a certain amount of the composite polylactic acid masterbatch and an equal amount of the polylactic acid resin. The polylactic acid composite fiber is difficult to ignite in butane gas flames under the condition of standard air, can realize self-extinguishing when take away from flames when ignited in the butane gas flames occasionally, has no obvious molten drops and does not ignite cottonflock located below the polylactic acid composite fiber. In addition, in a cone calorimeter test, the polylactic acid composite fiber has a significantly reduced smoke density in combustion compared with common phosphorus-containing flame-retardant polylactic acid fibers, recued by more than 80%.

Description

technical field [0001] The invention relates to the field of preparation of functional green fibers, in particular to a flame-retardant and smoke-suppressing enhanced polylactic acid composite fiber and a preparation method thereof. Background technique [0002] With the application and popularization of biodegradable green polylactic acid resin, the flammability and safety problems of its related products need to be solved urgently. [0003] For this reason, the Chinese patent whose publication number is CN104031364A discloses a kind of reinforced flame-retardant polylactic acid material, and described reinforced flame-retardant polylactic acid material is mixed by polylactic acid, modified kenaf, boron phenolic resin, polymer polycondensation type phosphate Formed, the mass ratio of the polylactic acid, modified kenaf, boron phenolic resin, polymer polycondensation type phosphate is 70:10:(2.5~10):(10~17.5), the modified kenaf is The kenaf is subjected to alkali treatment...

Claims

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Application Information

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IPC IPC(8): D01F6/92D01F1/07
CPCD01F1/07D01F6/92
Inventor 费宾陈淑盈忻浩忠
Owner THE HONG KONG POLYTECHNIC UNIV
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