Intumescent flame retardant polypropylene composite material and preparation method thereof

A technology of flame-retardant polypropylene and intumescent flame retardant, which is applied in the field of flame-retardant polypropylene materials, can solve the problems of damage to the mechanical properties of the base material, narrowing of the application range, poor compatibility of the base material, etc., and achieve improved impact and bending properties , low water solubility, not easy to migrate

Inactive Publication Date: 2017-09-05
SHUNDE POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, the intumescent flame retardants used still have the following disadvantages: 1. The addition amount is relatively large, usually 30% of the flame retardant needs to be added; 2. The compatibility with the substrate is poor, which affects the mechanical properties of the substrate. Greater damage
Based on the above reasons, the application range of intumescent flame retardants in polypropylene composites has been greatly reduced

Method used

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  • Intumescent flame retardant polypropylene composite material and preparation method thereof
  • Intumescent flame retardant polypropylene composite material and preparation method thereof
  • Intumescent flame retardant polypropylene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 3.345Kg of polypropylene pellets and 0.15kg of polypropylene wax into the high-speed dispersant and pre-mix for 2 minutes, then accurately weigh 1.0kg of ammonium polyphosphate (APP) and 0.5kg of triazine charcoal agent (CFA1) and 0.005kg of antioxidant (1010) were added to the above mixer and mixed for 15 minutes to obtain an intumescent flame retardant mixture, and finally the obtained intumescent flame retardant mixture was extruded in a twin-screw extruder , cooling, and granulation to obtain intumescent flame-retardant polypropylene composite materials. Wherein, the temperature of each zone of the twin-screw extruder is set between 150-200°C. The oxygen index of the obtained intumescent flame-retardant polypropylene composite material is 35.6%, and the UL-94 test reaches the V-0 level (3.2mm). After adding the carbon forming agent, the composite material formed a certain β crystal, and after the XRD test, there was an obvious β crystal, K β The value is 0.12....

Embodiment 2

[0026] First add 3.39Kg of polypropylene pellets and 0.10k of N,N-ethylene bisstearic acid amide (EBS) into the high-speed mixer and pre-mix for 5 minutes, and then accurately weigh 1.0kg of ammonium polyphosphate ( APP), 0.5kg of triazine char-forming agent (CFA2) and 0.010kg of antioxidant (168), added to a high-speed mixer and pre-mixed for 10 minutes to obtain an intumescent flame retardant mixture, and finally the intumescent flame retardant The mixture is extruded through a twin-screw extruder, cooled and granulated to obtain an expanded flame-retardant polypropylene composite material. Wherein, the temperature of each zone of the twin-screw extruder is between 150-200°C. The oxygen index of the polypropylene composite material is 33.6%, and the UL-94 test reaches the V-0 level. After adding the carbon forming agent, the composite material formed a certain β crystal, and after the XRD test, there was an obvious β crystal, K β The value is 0.08, such as figure 1 shown....

Embodiment 3

[0028] First add 3.44Kg of polypropylene powder and 0.05kg of calcium stearate into the high-speed disperser and pre-mix for 4 minutes; then accurately weigh 0.75kg of ammonium polyphosphate (APP) and 0.75kg of triazine compounds Charcoal (CFA3) and 0.01kg of antioxidant 264 were added to the above-mentioned high-speed mixer and pre-mixed for 8 minutes to obtain an intumescent flame-retardant mixture, which was finally extruded, cooled, and granulated in a twin-screw extruder, namely Intumescent flame retardant polypropylene composites are available. Wherein, the temperature of each zone of the twin-screw extruder is set between 150-200°C. The oxygen index of the polypropylene composite material is 31.1%, and the UL-94 test reaches the V-0 level. After adding the carbon forming agent, the composite material formed a certain β crystal, and after the XRD test, there was an obvious β crystal, K β The value is 0.05, such as figure 1 shown.

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Abstract

The invention relates to an intumescent flame retardant polypropylene composite material and a preparation method thereof. The preparation method is characterized by comprising the following steps: adding 60-85% of polypropylene and 0-5% of a lubricating agent into a high-speed mixer for dispersing at a high speed for 2-5 minutes so as to obtain a mixture; mixing the mixture with 15-35% of an intumescent flame retardant and 0.1-0.5% of an antioxidant for 5-20 minutes so as to obtain an intumescent flame retardant mixture; and performing extrusion pelletizing on the intumescent flame retardant mixture by using a twin-screw extruder or uniformly mixing by using a double-roller mixer, thereby obtaining the intumescent flame retardant polypropylene composite material. The intumescent flame retardant polypropylene composite material has the advantages that the heat resistance and water resistance of the flame retardant are improved; due to the structural design and adjustment of a char-forming agent, the char-forming agent has a certain beta-crystal nucleation effect, so that a certain beta crystal can be formed by the polypropylene composite material. Therefore, the impact property and bending property of the composite material are improved, and the composite material is low in water solubility and difficult to migrate.

Description

technical field [0001] The invention relates to the technical field of flame-retardant polypropylene materials, in particular to a halogen-free flame-retardant polypropylene composite material capable of improving impact strength and a preparation method thereof. Background technique [0002] Polypropylene (PP) is a general-purpose plastic with excellent comprehensive properties, which is widely used in household appliances, electronics, building materials, automobile industry and packaging materials. However, polypropylene also has some disadvantages, such as its oxygen index is only 17-18%, which is a flammable material; a large number of molten droplets are produced during combustion, and the fire hazard is relatively high, which limits the application of polypropylene in occasions with flame retardant requirements. use. With the wide application of polypropylene, its fire safety problem is becoming more and more serious. Therefore, it is very necessary to modify the fla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/00C08K5/3492C08K3/32
CPCC08L23/12C08K3/32C08K5/00C08K5/3492C08K5/34928C08L2201/02C08L2201/08C08L2201/22C08L2205/025C08L2205/242
Inventor 冯才敏黄健光梁敏仪郑小洁刘洪波
Owner SHUNDE POLYTECHNIC
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