Flame-retardant polypropelene composition and preparation thereof

A technology of flame-retardant polypropylene and composition, applied in the field of flame-retardant polypropylene composition and its preparation, can solve the problem that the long-term high-temperature use requirements of automobile bellows can not be satisfied, the thermal decomposition temperature of polyvinyl chloride is low, and the softening temperature of polyethylene is low. and other problems, to achieve good high-temperature thermal oxidation aging performance, stable thermal performance, and small impact on toughness.

Active Publication Date: 2011-07-06
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low thermal decomposition temperature of polyvinyl chloride, this kind of bellows cannot meet the long-term high-temperature use requirements of automotive bellows.
[0005] Patent CN2795602 introduces a double-wall corrugated pipe for coal mines. The double-wall corrugated pipe consists of a polyethylene inner wall containing a flame retardant and an antistatic masterbatch, and trapezoidal or arc-shaped corrugated pipes containing a flame retardant and an antistatic masterbatch. The outer wall of the polyethylene is pressed together; the pipe has strong flame retardant properties, non-toxic, corrosion-resistant, light in weight, easy to install, and high-pressure resistance, and is suitable for high-risk environments such as coal mines; but due to the low softening temperature of polyethylene , making the material difficult to use in the high temperature environment of the car
[0006] Although the flame-retardant polypropylene composition proposed in the prior art has the characteristics of good flame retardancy, insulation, and material toughness, it has problems such as easy corrosion of molds and low heat resistance, and cannot meet the requirements of automobile bellows for flame retardancy. Requirements for thermal oxygen stability and processability of polypropylene materials during extrusion processing and use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1755g of polypropylene B8101 (Yanshan Petrochemical), 160g of octabromoether flame retardant (Lianyungang Legend Flame Retardant Technology Co., Ltd.), 60g of antimony trioxide synergistic flame retardant, 6g of active magnesium hydroxide (imported from Japan), light stabilized Antioxidant (UV-944) 4g, antioxidant (1010) 3g, auxiliary antioxidant (DLTDP) 6g, zinc stearate 6g, mix uniformly in a high-speed mixer, and then, at a speed of 50 to 100 rpm Extrude at 190°C with a twin-screw extruder, cool, and pelletize to obtain a flame-retardant composition. The spline properties of the forming process are as follows:

[0025] Tensile strength 25MPa Flammability UL94V-2

[0026] Bending strength 28MPa Relative density 0.94g / cm 3

[0027] Bending strength 1100MPa Melt index 0.7g / 10min

[0028] Impact strength 75KJ / m 2 Appearance white

[0029] Test conditions: 150°C, oven with ventilation times 5-20 times / hour, sample thickness 0.8mm: no cracking and pulverization ...

Embodiment 2

[0031] 900g polypropylene B8101 (Yanshan Petrochemical), 885g polypropylene AS164 (Singapore TPC), octabromoether flame retardant (Lianyungang Legend Flame Retardant Technology Co., Ltd.) 140g, antimony trioxide synergistic flame retardant 45g, active hydrogen Magnesium oxide (imported from Japan) 6g, light stabilizer (UV-944) 4g, antioxidant (1010) 4g, auxiliary antioxidant (DSTDP) 8g, zinc stearate 8g, mix uniformly in a high-speed mixer, then, Extrude at 190° C. with a twin-screw extruder with a rotational speed of 50-100 rpm, cool and pelletize to obtain a flame-retardant composition. The spline properties of the forming process are as follows:

[0032] Tensile strength 26MPa Flammability UL94V-2

[0033] Bending strength 29MPa Relative density 0.94g / cm 3

[0034] Bending strength 1050MPa Melt index 0.8g / 10min

[0035] Impact strength 70KJ / m 2 Appearance white

[0036] The test condition is 150°C, the number of air changes is 5-20 times / hour, the oven is used, an...

Embodiment 3

[0038] With 1200g polypropylene B8101 (Yanshan Petrochemical), 600g polypropylene AS164 (Singapore TPC), 120g of octabromo-S ether flame retardant (Shouguang Ocean Chemical Co., Ltd.), 40g of antimony trioxide synergistic flame retardant, active hydrogen oxidation Magnesium (imported from Japan) 6g, light stabilizer (UV-944) 4g, antioxidant (1010) 6g, auxiliary antioxidant (DSTDP) 12g, zinc stearate 7g, mix uniformly in a high-speed mixer, then, in A twin-screw extruder with a rotating speed of 50-100 rpm is extruded at 190° C., cooled, and pelletized to obtain a polymerization-inhibiting composition. The spline properties of the forming process are as follows:

[0039] Tensile strength 24MPa Flammability UL94V-2

[0040] Bending strength 27MPa Relative density 0.94g / cm 3

[0041] Bending strength 1050MPa Melt index 0.6g / 10min

[0042] Impact strength 80KJ / m 2 Appearance white

[0043] The test condition is 150°C, the number of air changes is 5-20 times / hour, and the...

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Abstract

The present invention discloses a flame retarding polypropylene composition and a preparation method thereof. The flame retarding polypropylene composition consists of the following compositions in percentage by weight: 80 to 90 percent of polypropylene, 5 to 10 percent of an organic bromine flame retardant, 3 to 5 percent of a flame retarding synergist, 0.1 to 0.5 percent of an antioxidant, 0.15 to 0.35percent of a light stabilizer, 0.3 to 1 percent of an acid absorption addition agent, and 0.3 to 0.5 percent of a lubricant; and the compositions are put into a double screw extruder to extrude granulations, after the compositions are mixed in a high-speed mixer for 1 to 2 minutes. The flame retarding polypropylene composition has the advantages of excellent thermo oxidative resistance and aging resistance, high melt strength, easy extrusion molding, small corrosiveness to a mould and high cost performance, and can meet the requirement of thermo oxidative stability and processability of a corrugated pipe for an automobile on the flame retarding polypropylene material during processes of extrusion processing and using.

Description

technical field [0001] The invention relates to a flame-retardant polypropylene composition and a preparation method thereof. Background technique [0002] Corrugated pipes for automobiles require materials with good flame retardancy, heat resistance, insulation, and material toughness, and will not crack after long-term use. Generally, flame-retardant polypropylene materials have poor heat resistance and are prone to cracking in hot environments, making it difficult to meet the long-term use requirements in hot environments. [0003] Patent CN1346844 introduces the preparation materials of rigid polyvinyl chloride double-wall corrugated pipes. The invention improves the lubricity of the materials and prevents the "decomposition" phenomenon in the production process. The material has excellent low-temperature plasticizing properties and mold release properties, and the product's impact strength, ring stiffness, and Vicat softening temperature have been significantly improve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/06C08L23/10C08K5/372B29B9/12C08K5/13F16L11/11C08K3/22B29C47/92C08K13/02B29C48/40B29C48/92
CPCB29C48/92B29C2948/92704B29C48/04B29C48/40B29C2948/9259B29C2948/92885B29C2948/92895
Inventor 姜向新宁凯军陶四平夏建盟肖鹏郭熙桃杨霄云
Owner KINGFA SCI & TECH CO LTD
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