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Method for preparing halogen-free flame-proof polylactic acid

A technology of polylactic acid and flame retardant, which is applied in the field of preparation of halogen-free flame retardant polylactic acid, can solve the problems of limiting the application range of materials, unfavorable industrial production, dripping of melts, etc., and achieves a simple and effective preparation method and control of production costs. , the effect of mild process conditions

Inactive Publication Date: 2008-09-10
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resulting product has flame retardant and mechanical properties, but the disadvantage of this patent is that it uses a reactive phosphorus-containing flame retardant and uses an in-situ intercalation polymerization method, which is not conducive to industrial production
Halogen-free flame-retardant thermoplastic materials are accompanied by a large amount of molten material dripping when burning, especially when phosphate ester flame retardants are used, as the amount of flame retardants increases, the dripping phenomenon becomes quite serious, which is extremely large. Limits the scope of application of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Vacuum dry polylactic acid and ammonium polyphosphate at 30°C for 24 hours to remove moisture.

[0036] 2. The dried flame retardant ammonium polyphosphate and flame retardant additives pentaerythritol, melamine, zinc stearate, antioxidant tris (2,4-di-tert-butylphenyl) phosphite are dried by weight Stir and mix evenly in a container at high speed to obtain a flame retardant mixture. Wherein ammonium polyphosphate is 3 parts, pentaerythritol is 2 parts, melamine is 1 part, zinc stearate is 1 part, and antioxidant is 0.5 part.

[0037] 3. Mix the dried polylactic acid with the flame retardant mixture obtained in step (2), compatibilizer polycaprolactone, and coupling agent titanate LD-101 in a dry container according to a certain weight ratio, and then mix them in a dry container Blending and extrusion were carried out in an extruder, wherein the screw rotation speed was 250 rpm, and the extrusion temperature was 180°C. Among them, 90 parts of polylactic acid, 8.5 p...

Embodiment 2

[0042] 1. Vacuum dry polylactic acid, montmorillonite, and ammonium polyphosphate at 80°C for 3 hours to remove moisture.

[0043] 2. the dried flame retardant montmorillonite, ammonium polyphosphate and flame retardant additives pentaerythritol, melamine, antioxidant tris (2,4-di-tert-butylphenyl) ester in dry Stir and mix evenly in the container at high speed to obtain a flame retardant mixture. Wherein montmorillonite is 15 parts, ammonium polyphosphate is 8 parts, pentaerythritol is 4 parts, melamine is 3 parts, and antioxidant is 1 part.

[0044]3. Mix the dried polylactic acid with the flame-retardant mixture obtained in step (2), compatibilizer polycaprolactone, and coupling agent silane coupling agent KH550 in a dry container according to a certain weight ratio, and then Blending and extrusion were carried out in the extruder, wherein the screw rotation speed was 30 rpm, and the extrusion temperature was 150°C. Among them, polylactic acid is 64 parts, flame retardant...

Embodiment 3

[0048] 1. Dry polylactic acid and calcium stearate in vacuum at 80°C for 3 hours to remove moisture.

[0049] 2. Stir and mix the flame retardant tripenyl phosphate, the flame retardant additive calcium stearate, and the antioxidant phenylene diisodecyl phosphite in a dry container at high speed according to the weight ratio to obtain a flame retardant mixture. Among them, 15 parts of tripenyl phosphate, 3 parts of calcium stearate, and 1 part of antioxidant.

[0050] 3. Mix the dry polylactic acid with the flame retardant mixture obtained in step (2), the compatibilizer polyethylene glycol, and the coupling agent silane coupling agent KH550 in a dry container according to a certain weight ratio, and then extrude Blending and extrusion were carried out in the extruder, wherein the screw rotation speed was 130 rpm, and the extrusion temperature was 190°C. Among them, the polylactic acid is 77.9 parts, the flame retardant mixture is 19 parts, the coupling agent is 3 parts, and ...

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PUM

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Abstract

The invention belongs to the high molecular material technical field, and in particular relates to a preparation method of halogen-free fire-retarding poly lactic acid. The preparation method comprises the following steps: firstly, fire retardant, fire-retarding auxiliary agent and antioxidant are stirred according to a certain proportion to obtain fire-retarding mixture; then, poly lactic acid, the fire-retarding mixture, compatibilizer and coupling agent are mixed according to a certain proportion and are fused and mixed; and finally, the materials are made into fire-retarding poly lactic acid after cooling, pelleting and drying. The fire-retarding poly lactic acid, which has excellent fire-retarding performance and less fused dripping and can pass UL94 grade testing, can be used in fields such as airplane, automobile and electronic industry, which have strict requirements on material fire-retarding performance.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and in particular relates to a preparation method of halogen-free flame-retardant polylactic acid. Background technique [0002] Energy issues and environmental issues have promoted the development and application of biomaterials. Polylactic acid is a "green polymer" material whose raw material is derived from renewable non-staple agricultural products (such as cassava) starch and can be completely degraded into carbon dioxide and water. Polylactic acid is not only degradable, but also has many good mechanical properties and processing properties, and is known as the most promising "green plastic". However, polylactic acid, like other polymers, is easy to burn, which limits the application of polylactic acid in aviation, electronics, automobiles and other fields. It is necessary to endow polylactic acid with flame retardant properties by modification. [0003] The blending...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08K13/02C08K3/32C08K5/053C08K5/3492C08K5/098B29C47/92B29B7/72B29C48/92
CPCB29C47/92B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 任杰李树茂袁华于涛任天斌
Owner TONGJI UNIV
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