Compound halogen-free flame-retardant plant fiber reinforced polylactic acid material and preparation method thereof

A polylactic acid material and plant fiber technology, which is applied in the field of compound halogen-free flame retardant plant fiber reinforced polylactic acid material and its preparation, can solve the problem of large filling amount, adverse effects on physical properties of materials, deterioration of interface bonding of composite materials, etc. problems, to achieve the effect of small impact on physical properties, improved interface bonding force, and improved mechanical strength

Active Publication Date: 2020-10-20
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are disadvantages such as large filling amount, deterioration of the interface bonding of the composite material, and adverse effects on the physical properties of the material.

Method used

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  • Compound halogen-free flame-retardant plant fiber reinforced polylactic acid material and preparation method thereof
  • Compound halogen-free flame-retardant plant fiber reinforced polylactic acid material and preparation method thereof
  • Compound halogen-free flame-retardant plant fiber reinforced polylactic acid material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1 Discuss the influence of different dosages of compound flame retardants on the mechanical properties and flame retardant properties of the prepared polylactic acid / plant fiber composites

[0026] (1) Sample preparation

[0027] The composite halogen-free flame-retardant plant fiber reinforced polylactic acid material is prepared by the following method, and the specific steps are:

[0028] (1) Soak the plant fiber in a sodium hydroxide solution with a concentration of 3wt% for 6 hours. After washing with water, soak the plant fiber in water, add acetic acid to it until neutral, take out the plant fiber and dry it to obtain the surface modified Permanent plant fibers, wherein the plant fibers are ramie fibers, the plant fibers are continuous long fibers or chopped fibers, and the diameter of the plant fibers is 20-50 μm.

[0029] (2) Soak the surface-modified plant fiber prepared in step (1) in 3wt% ammonium polyphosphate solution for 7 hours for flame-retarda...

Embodiment 2

[0048] Example 2 Discuss the influence of different dosages of plant fibers on the mechanical properties and flame retardant properties of the prepared polylactic acid / plant fiber composites

[0049] (1) Sample preparation

[0050] The composite halogen-free flame-retardant plant fiber reinforced polylactic acid material is prepared by the following method, and the specific steps are:

[0051] (1) Soak the plant fiber in a sodium hydroxide solution with a concentration of 3wt% for 6 hours. After washing with water, soak the plant fiber in water, add acetic acid to it until neutral, take out the plant fiber and dry it to obtain the surface modified Permanent plant fibers, wherein the plant fibers are ramie fibers, the plant fibers are continuous long fibers or chopped fibers, and the diameter of the plant fibers is 20-50 μm.

[0052] (2) Soak the surface-modified plant fiber prepared in step (1) in 3wt% ammonium polyphosphate solution for 7 hours, perform flame-retardant pretr...

Embodiment 3

[0062] Example 3 Discuss the effects of different processes on the mechanical properties and flame retardant properties of polylactic acid / plant fibers

[0063] (1) Sample preparation

[0064] The composite halogen-free flame-retardant plant fiber reinforced polylactic acid material is prepared by the following method, and the specific steps are:

[0065] (1) Soak the plant fiber in a sodium hydroxide solution with a concentration of 3wt% for 6 hours. After washing with water, soak the plant fiber in water, add acetic acid to it until neutral, take out the plant fiber and dry it to obtain the surface modified Permanent plant fibers, wherein the plant fibers are ramie fibers, the plant fibers are continuous long fibers or chopped fibers, and the diameter of the plant fibers is 20-50 μm.

[0066] (2) Soak the surface-modified plant fiber prepared in step (1) in 3wt% ammonium polyphosphate solution for 7 hours, perform flame-retardant pretreatment, take it out and dry it, and ob...

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Abstract

The invention belongs to the technical field of modification of biodegradable polymer materials, and particularly relates to a compound halogen-free flame-retardant plant fiber reinforced polylactic acid material and a preparation method thereof. The preparation method comprises the following steps: (1) putting plant fibers into 1-8 wt% of an alkaline solution, carrying out surface modification, putting the modified plant fibers into 0.5-5 wt% of an ammonium polyphosphate solution, and carrying out flame-retardant treatment to obtain flame-retardant plant fibers; and (2) uniformly mixing polylactic acid, a compound flame retardant, a flexibilizer and an antioxidant, carrying out melt blending on the obtained mixture and the flame-retardant plant fiber obtained in the step (1), and carryingout cooling granulation to obtain a polylactic acid / plant fiber composite material with flame retardancy, namely the compound halogen-free flame-retardant plant fiber reinforced polylactic acid material. According to the invention, the plant fibers are subjected to flame retardant pretreatment, so that the flame retardant property and mechanical strength of the plant fiber / polylactic acid composite material are significantly improved.

Description

technical field [0001] The invention belongs to the technical field of modification of biodegradable polymer materials, and in particular relates to a composite halogen-free flame-retardant plant fiber reinforced polylactic acid material and a preparation method thereof. Background technique [0002] As a renewable resource raw material, polylactic acid (PLA) can be decomposed by microorganisms in a short time, and the decomposed products are water and carbon dioxide. The excellent mechanical properties, biocompatibility and processability of PLA make it widely used in food packaging, biomedical and other fields, but in the field of engineering applications, the mechanical strength of PLA still needs to be improved. Glass fiber can greatly improve the mechanical strength and modulus of PLA, but at the expense of the degradability of the material. The carbon fiber that has been lightweighted and promoted will increase the production cost of PLA products, making it difficult ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/02C08L67/02C08K5/5399C08K3/32C08K5/134C08K5/526C08K13/02C08J5/06
CPCC08J5/06C08J2367/04C08J2401/02C08J2467/02C08K5/5399C08K2003/323C08K5/1345C08K5/526C08K13/02
Inventor 李海梅李桂丽陈毅非叶勇林军
Owner ZHENGZHOU UNIV
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