Preparation method of halogen-free flame-retardant toughening polypropylene composite material

A composite material, polypropylene technology, applied in the field of polypropylene composite material preparation, can solve the problem of reducing the flame retardant performance and thermal stability performance of the composite material system, the processing performance of the composite material, the negative impact of mechanical properties, and the deterioration of the mechanical toughness of the matrix polymer. and other problems, to achieve the effect of overcoming the decline of mechanical toughness, good processing performance and low production cost

Inactive Publication Date: 2012-09-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its flame retardant efficiency is low, and a larger filling amount (>60%) is usually required to meet the flame retardant requirements of plastics; and the interface bonding force between magnesium hydroxide inorganic particles and polypropylene is very small, and the compatibility is very poor. The dispersion in polypropylene is very uneven; thus, it has a great negative impact on the processing performance and mechanical properties of the composite material, especially the severe deterioration of the mechanical toughness of the matrix polymer.
[0003] In the prior art, the surface modification treatment of magnesium hydroxide par

Method used

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  • Preparation method of halogen-free flame-retardant toughening polypropylene composite material
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  • Preparation method of halogen-free flame-retardant toughening polypropylene composite material

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Embodiment 1

[0020] A specific embodiment of the present invention is a preparation method of a halogen-free flame-retardant toughened polypropylene composite material, the specific method of which is as follows:

[0021] 1. Put 100 parts of dried magnesium hydroxide in a high-speed stirrer, then spray 2.0 parts of silane coupling agent on the surface of magnesium hydroxide, and stir for 30 minutes at a temperature of 100°C. Be 2000rpm, obtain modified magnesium hydroxide;

[0022] II, the modified magnesium hydroxide that step I obtains and 80 parts of weight dry polypropylenes, 18 parts weight dry polyolefin elastomers, 2.0 parts weight polyolefin elastomer graft maleic anhydride-styrene, 0.05 parts Heavy antioxidant, 0.1 part of heavy lubricant, placed in a mixer and mixed uniformly to obtain a compound;

[0023] III. Mix and granulate the mixture obtained in step II in a twin-screw extruder, dry the extruded pellets and inject them on an injection molding machine.

Embodiment 2

[0025] A method for preparing a halogen-free flame-retardant and toughened polypropylene composite material, the specific method of which is:

[0026] 1. Place 100 parts of dried magnesium hydroxide in a high-speed stirrer, then spray 2.0 parts of silane coupling agent on the surface of magnesium hydroxide, and stir for 25 minutes at a temperature of 80°C. Be 1800rpm, obtain modified magnesium hydroxide;

[0027] II, the modified magnesium hydroxide that step I obtains and 79 parts by weight of dry polypropylene, 20 parts of weight of dry polyolefin elastomer, 1.0 part of weight of polyolefin elastomer grafted maleic anhydride-styrene, 0.05 part Heavy antioxidant 0.1 part of heavy lubricant is placed in a mixer and mixed evenly to obtain a compound;

[0028] III. Mix and granulate the mixture obtained in step II in a twin-screw extruder, dry the extruded pellets and inject them on an injection molding machine.

Embodiment 3

[0030] A method for preparing a halogen-free flame-retardant and toughened polypropylene composite material, the specific method of which is:

[0031] 1. Place 100 parts of dried magnesium hydroxide in a high-speed stirrer, then spray 2.0 parts of silane coupling agent on the surface of magnesium hydroxide, and stir for 35 minutes at a temperature of 120°C. Be 1500rpm, obtain modified magnesium hydroxide;

[0032] II, the modified magnesium hydroxide that step I obtains and 80 parts by weight of dry polypropylene, 18.5 parts of weight of dry polyolefin elastomer, 1.5 parts of weight of polyolefin elastomer graft maleic anhydride-styrene, 0.05 part Heavy antioxidant 0.1 part of heavy lubricant is placed in a mixer and mixed evenly to obtain a compound;

[0033] III. Mix and granulate the mixture obtained in step II in a twin-screw extruder, dry the extruded pellets and inject them on an injection molding machine.

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Abstract

The invention discloses a preparation method of halogen-free flame-retardant toughening polypropylene composite material, which mainly comprises the steps of: carrying out surface modification on 100 parts by weight of magnesium hydroxide by 2.0 parts by weight of surface modifier in a high-speed mixer, wherein the modification temperature is 80-120 DEG C, the time is 25-35min and the rotating speed is 1500-2000rpm; evenly mixing the modified magnesium hydroxide with 77-80 parts by weight of dry polypropylene, 17-20 parts by weight of dry polyolefin elastomer, 1.0-3.0 parts of by weight of maleic anhydride graft copolymer, 0.05 parts by weight of antioxidant and 0.1 parts of lubricating agent to obtain mixture; and then, mixing and pelleting the mixture in a double-screw extruder, drying the extruded aggregates and carrying out injection molding on the aggregates in an injection molding machine. The method is simple in technology and good in repeatability; and the prepared halogen-free flame-retardant toughening polypropylene composite material has good mechanical toughness and flame-retardant property.

Description

technical field [0001] The invention relates to a method for preparing a halogen-free flame-retardant polypropylene composite material with high toughness. Background technique [0002] Polypropylene (PP) is a thermoplastic with excellent comprehensive properties and widely used in industries such as electronic appliances, instrumentation, automobiles and construction. However, its application fields are greatly limited due to its shortcomings such as flammability and molten dripping, so it is necessary to carry out flame retardant treatment on it. Among the many types of flame retardants, magnesium hydroxide (MH) has the characteristics of not producing corrosive halogen gas and harmful gas, non-volatile, long-lasting effect, non-toxic, smoke-free, and non-melting droplets, etc., and has been widely valued. However, its flame retardant efficiency is low, and a larger filling amount (>60%) is usually required to meet the flame retardant requirements of plastics; and the ...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L51/06C08L23/00C08K9/04C08K9/06C08K3/22
Inventor 陈晓浪于杰徐阳孙志丹胡书春张志斌
Owner SOUTHWEST JIAOTONG UNIV
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