A low-additive halogen-free flame-retardant polylactic acid composite material and preparation method thereof

A composite material and polylactic acid technology, which is applied in the field of low-additive halogen-free flame-retardant polylactic acid composite material and its preparation, and can solve the problems of environmental pollution, toxicity, and large addition amount.

Active Publication Date: 2018-09-21
马德里高等材料研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Halogen-containing flame retardants were used early in the prior art, but the addition of such flame retardants will cause a large amount of smoke when the material is burned, and produce toxic, harmful, and strongly corrosive gases, seriously polluting the environment and threatening human life and health
[0005] In industrial production, the use of halogen-free flame retardants magnesium hydroxide and aluminum hydroxide flame-retardant polylactic acid, although the flame-retardant performance is good, but the addition of a large amount leads to a significant decrease in the mechanical properties and apparent physical properties of polylactic acid composites , and the price is relatively expensive, which is not conducive to the industrial application of polylactic acid
In addition, according to existing literature and patent reports, adding halogen-free phosphorus-containing flame retardants is one of the effective means to improve the flame retardancy of polylactic acid, but halogen-free phosphorus-containing inorganic or organic flame retardants generally require higher The addition amount can achieve the flame retardant performance required by the industry, but the high addition amount reduces the heat resistance and mechanical properties of polylactic acid

Method used

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  • A low-additive halogen-free flame-retardant polylactic acid composite material and preparation method thereof
  • A low-additive halogen-free flame-retardant polylactic acid composite material and preparation method thereof
  • A low-additive halogen-free flame-retardant polylactic acid composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0082] Experimental Example 1 Determination of Limiting Oxygen Index

[0083] According to the ASTM D2863-97 standard, the limiting oxygen index value of the material is obtained, which indicates the minimum oxygen content volume percentage required to maintain its combustion after the material is ignited in a mixed gas of oxygen and nitrogen. The higher the limiting oxygen index value, the higher the limit oxygen index value of the material The less combustible it is, the better the flame retardancy. It is generally believed that the limiting oxygen index is less than 22 and belongs to flammable materials, between 22 and 27 belongs to combustible materials, and greater than 27 belongs to flammable materials.

[0084] Experimental Example 2 Vertical Burning Test

[0085] According to the ASTM D3801 standard, the vertical burning level of the material is obtained, which is used to reflect the flame propagation performance of the material surface. According to a certain flame he...

experiment example 4

[0088] Experimental Example 4 Hardness Test

[0089] According to the nano-indentation technology ASTM E2546 standard to test and calculate, the hardness value of the material is obtained, which reflects the ability of the material surface to resist the intrusion of other harder objects. The larger the hardness value, the harder the material.

Embodiment 1

[0091] Embodiment 1 The preparation method of low-addition type halogen-free flame-retardant polylactic acid composite material

[0092]The polylactic acid was vacuum-dried at 80°C for 4 hours, and the dried polylactic acid, flame retardant, optional flame retardant additive, optional antioxidant and optional lubricant were placed in a high-speed mixer Stir evenly, put the above mixture in a twin-screw extruder for melt blending, and extrude to granulate. The temperature settings of each section of the twin-screw extruder are as follows: feed inlet 155°C, feed section 160°C, The compression section is 160°C, the metering section is 165°C, the adapter is 170°C, the die section is 165°C, the screw speed of the main engine is 190rpm, the conveying screw speed is 30rpm, the feeding speed of the barrel is 16s, and the extruded material is air-cooled and then air-dried and pelletized to obtain the low-addition halogen-free flame-retardant polylactic acid composite material in granul...

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Abstract

The invention discloses a low addition type halogen-free and flame-retardant polylactic acid composite and a preparation method thereof. The composite is prepared from polylactic acid, a flame retardant, an optional flame retardant additive, an optional antioxidant and an optional lubricant, wherein the flame retardant is a phosphate, phosphamide, phosphoryl ester or phosphoramidate compound; the flame retardant additive is inorganic filler or organically modified inorganic filler. The preparation method of the polylactic acid composite comprises the following steps: polylactic acid is dried under vacuum and uniformly mixed with the flame retardant, the optional flame retardant additive, the optional antioxidant and the optional lubricant, and the mixture is placed in a twin-screw extruder for melt blending and extrusion pelletizing. The low addition type halogen-free and flame-retardant polylactic acid composite is low in adding quantity of the flame retardant, good in flame retardance and environment-friendly, and the mechanical properties are not reduced but are even increased; the preparation method is simple, convenient, fast, low in cost and suitable for industrial production.

Description

technical field [0001] The invention relates to a flame-retardant polymer composite material, in particular to a low-addition halogen-free flame-retardant polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a new type of biodegradable material. It is a polymer obtained by polymerization of lactic acid as the main raw material. The source of its raw material is sufficient and renewable. The production process is pollution-free. The product can be biodegraded and realize the cycle in nature. , so it is an ideal green polymer material. In addition, polylactic acid has good biocompatibility, thermal stability and heat resistance, as well as good dimensional stability, mechanical properties and electrical insulation properties. It can be used to make packaging materials, fibers and nonwovens, etc., in many It is widely used in various industrial production fields and pharmaceutical fields. [0003] However,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K13/02C08K5/523C08K5/5399C08K3/22C08K3/34C08K13/06C08K9/04B29C47/92B29C48/92
Inventor 王德义赵小敏李志张秀芹王锐
Owner 马德里高等材料研究院
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