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Halogen-free intumescent flame-retardant polypropylene mixture and preparation method thereof

A technology of flame retardant polypropylene and intumescent flame retardant, which is applied in the field of resin flame retardant modification, can solve the problems of many polar groups, high water solubility of pentaerythritol, unsatisfactory water resistance and flame retardant efficiency, and achieve Excellent water resistance, less flame retardant dosage, and excellent mechanical properties

Inactive Publication Date: 2012-07-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water solubility of pentaerythritol is much greater than that of ammonium polyphosphate, so only coating modification of ammonium polyphosphate cannot effectively improve the water resistance of the system
Patent CN101225187A discloses a new type of triazine char-forming agent, which is compounded with ammonium polyphosphate to prepare a polypropylene mixture with good flame retardancy and mechanical properties, but the polar group of the char-forming agent used is More clusters, the water resistance and flame retardant efficiency of the system are not ideal
Marosi reported a polyborosiloxane flame retardant with good water resistance and synergistic effect, and compounded it with ammonium polyphosphate, pentaerythritol, etc. to prepare an intumescent flame-retardant PP material with excellent flame-retardant properties ( Ceramic precursor in flame retardant systems.Polymer Degradation and Stability, 2002,77 (2): 259-265), but due to the large water solubility of pentaerythritol, the water resistance of the prepared mixture is still unsatisfactory

Method used

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  • Halogen-free intumescent flame-retardant polypropylene mixture and preparation method thereof
  • Halogen-free intumescent flame-retardant polypropylene mixture and preparation method thereof
  • Halogen-free intumescent flame-retardant polypropylene mixture and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] This example is the preparation of a silicon-containing triazine macromolecule char-forming agent and an organic ceramic precursor.

[0020] Add 36.8g of cyanuric chloride and 50mL of acetone in a 500mL four-necked flask equipped with a reflux condenser, a thermometer, a stirrer and a constant pressure dropping funnel, and put the reaction flask into an ice-water bath and stir fully to disperse the cyanuric chloride. Evenly, control the temperature at 0-2°C, then slowly add 44.2g of γ-aminopropyltriethoxysilane and sodium hydroxide solution (8g of sodium hydroxide dissolved in 30mL of distilled water) dropwise while stirring, and control the temperature during the reaction. The temperature of the reaction system is 0-2° C., the pH value is 6, the dropwise addition time is 2 hours, and the reaction is continued for 5 hours after the dropwise addition is completed. Then the temperature was raised to 50°C, and 12g of ethylenediamine and sodium hydroxide solution (10g of so...

Embodiment 2～10 and comparative example 1～3

[0024] This group of examples is the preparation of the halogen-free intumescent flame-retardant polypropylene mixture of the present invention.

[0025] According to the formula shown in Table 1, polypropylene (PP) was first added to the open double-roller heating machine with a roll temperature of 175°C, and after it was melted and covered with rolls, antioxidant B215, phosphorus-nitrogen intumescent flame retardant, Silicon-containing triazine macromolecular char-forming agent (Si-TBM), pentaerythritol (PER), organic ceramic precursor (pBSil), and phosphorus-containing nano-montmorillonite (PMMT). After mixing for 15 minutes, the flakes are produced, and then placed on a flat vulcanizer After hot pressing at 180°C, cold pressing at room temperature, and sheeting, a flame-retardant PP sample for testing mechanical properties and flame-retardant properties was prepared on a universal prototype machine. The test results are shown in Table 2.

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Abstract

The invention discloses a halogen-free intumescent flame-retardant polypropylene mixture and a preparation method thereof and relates to the field of resin flamer-retardant modification. The mixture comprises the following components: polypropylene, a phosphorus-nitrogen intumescent flame retardant, a silicon-containing triazine macromolecule charring agent, an organic ceramic precursor, phosphorus-containing nano montmorillonite and an antioxidant; and the polypropylene mixture is prepared by carrying out melt blending on the components. Compared with the prior art, the mixture prepared by the invention has the characteristics of outstanding water resistance, good flame retardance, excellent mechanical property and the like and can be widely applied to the fields of the automobile industry, wires and cables, building materials and the like.

Description

technical field [0001] The invention belongs to the field of resin flame-retardant modification, and in particular relates to a halogen-free intumescent flame-retardant polypropylene mixture and a preparation method thereof. Background technique [0002] Polypropylene (PP), as one of the polymer materials with the largest output, is widely used in the automotive industry, house decoration, electronics and electrical fields. However, PP is a flammable material, its limiting oxygen index (LOI) is only 17.0-17.5, and PP is not easy to form charcoal in the combustion process, accompanied by a large number of molten droplets, its further development and application are severely restricted. Therefore, it is necessary to conduct flame retardancy research on PP. The flame retardant modification of traditional PP is mainly realized by adding halogen-containing flame retardants. Although such flame retardants have outstanding effects, they will release a large amount of smoke and tox...

Claims

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Application Information

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IPC IPC(8): C08L23/10C08K13/06C08K7/26C08K5/3492C08K3/32C08K3/38C08K9/04C08K3/34
Inventor 曾幸荣赖学军李红强刘琼宇唐霜尹昌宇张海丽
Owner SOUTH CHINA UNIV OF TECH
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