A kind of reinforced flame-retardant polylactic acid material and preparation method thereof

A polylactic acid material and polylactic acid technology are applied in the field of enhanced flame retardancy of polylactic acid material, which can solve the problems of large amount of addition, high cost and poor effect, and achieve the advantages of promoting carbonization, improving mechanical properties and improving dispersion effect. Effect

Inactive Publication Date: 2016-01-20
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of using a single flame retardant is not good, and the addition amount is large, and the cost is high. Therefore, it is a wise move to modify polymer materials to select a suitable flame retardant for compound use.

Method used

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  • A kind of reinforced flame-retardant polylactic acid material and preparation method thereof
  • A kind of reinforced flame-retardant polylactic acid material and preparation method thereof
  • A kind of reinforced flame-retardant polylactic acid material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: (the mass ratio of polylactic acid, modified kenaf, boron phenolic resin, and polymer polycondensation type phosphate is 70:10:2.5:17.5)

[0035] Weigh 35g of polylactic acid pellets, 5g of modified kenaf, 1.25g of boron phenolic resin, and 8.75g of PX-220 and add them to the torque rheometer after being fully mixed. The rheological temperature is 175°C and the output speed is 30rpm. The polylactic acid material is measured according to the GB / T2406.2-2009 standard test method, the limiting oxygen index is 25.0%, and the char formation rate at 600°C is 3.29%; the tensile strength is 53.6MPa according to the GB / T1040-2006 standard test method.

Embodiment 2

[0036] Example 2: (the mass ratio of polylactic acid, modified kenaf, boron phenolic resin, and polymer polycondensation type phosphate is 70:10:5:15)

[0037] Weigh 35g of polylactic acid pellets, 5g of modified kenaf, 2.5g of boron phenolic resin, and 7.5g of PX-220 and add them to the torque rheometer after being fully mixed. The rheological temperature is 175°C and the output speed is 30rpm. The polylactic acid material is measured according to the GB / T2406.2-2009 standard test method, the limiting oxygen index is 25.0%, and the char formation rate at 600°C is 6.78%; the tensile strength is 54.1MPa according to the GB / T1040-2006 standard test method.

Embodiment 3

[0038] Embodiment 3: (the mass ratio of polylactic acid, modified kenaf, boron phenolic resin, polymer polycondensation type phosphate is 70:10:10:10)

[0039] Weigh 35g of polylactic acid pellets, 5g of modified kenaf, 5g of boron phenolic resin, and 5g of PX-220 and add them to the torque rheometer after being fully mixed. The rheological temperature is 175°C and the output speed is 30rpm to obtain polylactic acid The material is measured according to the GB / T2406.2-2009 standard test method, the limiting oxygen index is 24.5%, and the char formation rate at 600°C is 7.49%; the tensile strength is 55.8MPa according to the GB / T1040-2006 standard test method.

[0040] like figure 1 As shown, the addition of boron phenolic resin increases the tensile strength of the polylactic acid material, and with the increase of the addition amount, the mechanical properties show an upward trend, which compensates the influence of PX-220 on the mechanical properties of the material to a cer...

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Abstract

The invention relates to a reinforced flame retardant polylactic acid material and a preparation method thereof. The polylactic acid material comprises polylactic acid particles, modified hibiscus cannabinus, boron-containing phenol-formaldehyde resin and high molecular poly-condensed phosphate. The preparation method of the reinforced flame retardant polylactic acid material comprises the following steps: (1) first, carrying out alkali treatment on hibiscus cannabinus, then modifying hibiscus cannabinus by vinyl trimethoxy silane and grinding for later use; and (2) adding the polylactic acid particles and the modified hibiscus cannabinus, boron-containing phenol-formaldehyde resin and high molecular poly-condensed phosphate in a certain proportion into a torque rheometer to prepare the hibiscus cannabinus, boron-containing phenol-formaldehyde resin and high molecular poly-condensed phosphate reinforced flame retardant polylactic acid material. The flame retardant polylactic acid material is simple in formula, halogen-free and environment-friendly and remarkable in charring performance after combustion, so that the flame is effectively prevented from further spreading, and meanwhile, the tensile strength is improved.

Description

technical field [0001] The invention belongs to the technical field of enhanced flame-retardant polylactic acid materials, and in particular relates to an enhanced flame-resistant polylactic acid material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a biodegradable polymer. In recent years, it has attracted more and more attention from experts and scholars because of its abundant sources, low price and good mechanical properties. PLA can be made into sheets, foams, molded articles, fibers, etc. In order to better meet the needs of electronic power equipment, transportation and other fields, the flame retardancy and reinforcement modification of polylactic acid has become an important topic. [0003] Natural fibers, such as flax, coconut shell, flax, sisal, etc., are used as reinforcing materials to enhance modified polymers because of their high mechanical strength, abundant sources, low density, and low price. Kenaf, rich in Chi...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C08L67/04C08L61/14C08L97/02C08L85/02
Inventor王新龙周露王通文史加新黄颖杨媛媛廖逢辉居亚庆
OwnerNANJING UNIV OF SCI & TECH