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Expansion type 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 low flame-retardant efficiency, large addition amount, and large hygroscopicity, and achieve high flame-retardant efficiency and low smoke density , the effect of small amount of smoke

Inactive Publication Date: 2011-07-27
SUN YAT SEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN101225187A discloses a novel triazine intumescent flame retardant, which is compounded with ammonium polyphosphate (APP) and used in PP to have good flame retardant performance, but the polar group in the reported char-forming agent More, resulting in greater hygroscopicity of the product
[0006] However, the intumescent flame retardants currently used still have the following disadvantages: 1. The flame retardant efficiency is low, and the addition amount is relatively large. Usually, it is necessary to add 30% or more of the flame retardant to achieve a higher flame retardant level; 2. The compatibility with the base material is poor, and the mechanical properties of the base material are greatly damaged; 3. The intumescent flame retardant has a high water solubility and is easy to absorb moisture, so it is not suitable for long-term contact with water
Based on the above reasons, the application range of intumescent flame retardants in polypropylene composites is greatly limited

Method used

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  • Expansion type flame-retardant polypropylene composite material and preparation method thereof
  • Expansion type flame-retardant polypropylene composite material and preparation method thereof
  • Expansion type flame-retardant polypropylene composite material and preparation method thereof

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preparation example Construction

[0029] The preparation method of the above-mentioned flame-retardant polypropylene composite material comprises the following sequential steps: (1) putting intumescent flame retardant, flame-retardant synergist, antioxidant, anti-dripping agent and lubricant into the high-speed mixer according to the formula ratio Internal mixing for 8-20 minutes; (2) Put polypropylene into a high-speed mixer and mix with the above mixture for 5-20 minutes; (3) Extrude and granulate with a twin-screw extruder, or mix with a twin-roller mixer uniform.

[0030] The present invention will be further illustrated by specific examples below, but the present invention is not limited to this specific example.

[0031] The triazine char-forming agent in each embodiment adopts the material of following structural formula respectively:

[0032]

Embodiment 1

[0034] Accurately weigh 1.0kg of ammonium polyphosphate (APP), 0.5kg of triazine char-forming agent (CA1), 0.015kg of antioxidant 1010 and 0.005kg of zinc stearate, and pre-mix for 8 minutes in a high-speed dispersant to obtain Intumescent flame retardant compound, then add 3.48Kg of polypropylene pellets to the above intumescent flame retardant compound, pre-mix for 5 minutes, and finally extrude, cool, and pelletize in a twin-screw extruder, The halogen-free flame-retardant polypropylene composite material can be obtained. 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 V-0 level.

Embodiment 2

[0036] Accurately weigh 1.0kg of ammonium polyphosphate (APP), 0.5kg of triazine char-forming agent (CA2), 1680.015kg of antioxidant and 0.005kg of N,N-ethylene bisstearic acid amide (EBS) at high speed Pre-mixed in the dispersant for 10 minutes to obtain an intumescent flame retardant compound, then 3.48Kg of polypropylene pellets were added to the above-mentioned intumescent flame retardant compound, pre-mixed for 5 minutes, and finally in a twin-screw extruder Extrude, cool, and granulate to obtain a halogen-free 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 29.5%, and the UL-94 test reaches the V-0 level.

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Abstract

The invention discloses an expansion type flame-retardant polypropylene composite material and a preparation method thereof. An expansion type flame retardant of the system is compounded by ammonium polyphosphate (APP) or melamine polyphosphate (MPP) and a novel triazine car-forming agent; and the expansion type flame-retardant polypropylene composite material is obtained by the following steps of: adding 10-40% of the expansion type flame retardant into 60-90% of polypropylene, mixing, extruding for pelleting, or mixing. The expansion type flame-retardant polypropylene composite material hasthe advantages of low smoke, no toxin, environment friendliness, high flame retardant efficiency, less volume of addition, good water resistance and the like; moreover, defects such as poor water resistance, low flame retardant efficiency and the like of traditional expansion type flame retardants are overcome, and the pollution on the environment and the harm to the human body, caused by flame-retardant materials, are effectively reduced.

Description

technical field [0001] The invention relates to the technical field of flame-retardant polypropylene materials, in particular to an intumescent flame-retardant polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene (PP) has the advantages of good mechanical properties, processing properties, chemical corrosion resistance, electrical insulation and non-toxic light weight. It is a general-purpose plastic with excellent comprehensive properties and is widely used in household appliances, electronics, and building materials. , the automobile industry, packaging materials, etc. 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, which makes the flame spread, and the fire hazard is relatively high, which limits the use of polypropylene in high Use in occasions where flame retardancy is req...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/14C08K13/02C08K3/32C08K5/3492
Inventor 许家瑞冯才敏张艺刘四委蒋星池振国
Owner SUN YAT SEN UNIV
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