A flame-retardant heat-resistant reinforced polylactic acid composition and its preparation method

A technology of enhanced heat resistance and polylactic acid, which is applied in the field of polylactic acid materials, can solve problems such as mechanical property degradation and heat resistance effects, and achieve the effects of less damage to the environment and human body, high flame retardant effect, and small production volume

Inactive Publication Date: 2016-03-02
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A single addition usually cannot achieve a good effect, and it will cause problems such as a decrease in mechanical properties and heat resistance. However, the joint use of multiple additives can effectively solve this problem. Therefore, the development of a multi-component compounding system and The use has become a hot spot in the research of flame retardant materials

Method used

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  • A flame-retardant heat-resistant reinforced polylactic acid composition and its preparation method
  • A flame-retardant heat-resistant reinforced polylactic acid composition and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Weigh 34g of polylactic acid pellets, 6g of oligomeric aryl phosphate (PX-220), at the extrusion temperature of 175°C in the first zone, 176°C in the second zone, 177°C in the third zone, and 177°C in the fourth zone Under the conditions, the polylactic acid composition is obtained by adding a conical twin-screw extruder, extruding and cooling. Measured according to GB / T2406-1993 standard test method, the limiting oxygen index is 33%. Define the temperature when the mass loss is 5wt% as the initial decomposition temperature, the initial decomposition temperature of the material is 334 ° C, see the tensile strength figure 2 .

Embodiment 2

[0030] Example 2: Weigh 34g of polylactic acid pellets, 4.8g of oligomeric aryl phosphate (PX-220) and 1.2g of vinyl silicone resin, and the extrusion temperature is 175°C in the first zone, 176°C in the second zone, and 176°C in the third zone Under the conditions of 177°C and 177°C in the fourth zone, feed into a conical twin-screw extruder, extrude and cool to obtain a polylactic acid composition. Measured according to GB / T2406-1993 standard test method, the limiting oxygen index is 32.2%. Define the temperature when the mass loss is 5wt% as the initial decomposition temperature, the initial decomposition temperature of the material is 342 ° C, see the tensile strength figure 2 .

Embodiment 3

[0031] Example 3: Weigh 34g of polylactic acid pellets, 3.6g of oligomeric aryl phosphate (PX-220) and 2.4g of vinyl silicone resin, and the extrusion temperature is 175°C in the first zone, 176°C in the second zone, and 176°C in the third zone Under the conditions of 177°C and 177°C in the fourth zone, feed into a conical twin-screw extruder, extrude and cool to obtain a polylactic acid composition. Measured according to GB / T2406-1993 standard test method, the limiting oxygen index is 30.5%. Define the temperature when the mass loss is 5wt% as the initial decomposition temperature, the initial decomposition temperature of the material is 342 ° C, see the tensile strength figure 2 .

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Abstract

The invention discloses a flame-retardant heat-resistant reinforced polylactic acid composition and a preparation method thereof. The polylactic acid composition is prepared from the following components by mass percent: 85% of polylactic acid, 0% to 12% of vinyl silicone resin and 3% to 15% of halogen-free phosphate ester flame retardant. The preparation method comprises the following steps: mixing the polylactic acid, the vinyl silicone resin and the halogen-free phosphate ester flame retardant in proportion; adding the mixture into a double-screw extruder under a conventional feeding speed, a conventional feeding temperature and a conventional rotating speed of screw rods; and extruding, cooling and cutting into granules. The flame-retardant heat-resistant reinforced polylactic acid composition is simple in formula and free of halogen, wherein the formula proportion of the polylactic acid, the vinyl silicone resin and the halogen-free phosphate ester flame retardant is reasonably regulated, so that the polylactic acid has flame-retardant and heat-resistant effects; in addition, the tensile strength of the polylactic acid can be improved. Thus, the harms and the pollutions of the polylactic acid composition to human bodies and environments are low.

Description

technical field [0001] The invention relates to a polylactic acid material, in particular to a flame-retardant and heat-resistant reinforced polylactic acid composition and a preparation method thereof. Background technique [0002] Polylactic acid is a biodegradable material with good transparency, high strength, good biocompatibility, and bioabsorbability. It is an ideal green polymer material. Due to many good properties, polylactic acid has been widely used in fibers, films, sheets, automobiles and electronic appliances. However, polylactic acid is a flammable material, its limiting oxygen index is about 20%, and polylactic acid has poor heat resistance. The flame retardants used in the flame retardant of polylactic acid can be divided into halogen flame retardants, phosphorus flame retardants, nitrogen flame retardants and metal compound flame retardants. Among them, the use of halogen-based flame retardants has been restricted due to the release of toxic and corrosiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L83/07C08L85/02B29C47/92B29C48/92
CPCB29C48/40B29C2948/92704
Inventor 王新龙廖逢辉王通文周露杨媛媛黄颖居亚庆史加新
Owner NANJING UNIV OF SCI & TECH
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