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Preparation method of halogen-free composite flame retardant polypropylene/thermoplastic polyurethane elastomer composite material

A thermoplastic polyurethane and composite flame-retardant technology, which is applied in the field of preparation of halogen-free composite flame-retardant polypropylene/thermoplastic polyurethane elastomer composite materials, can solve the problems of application limitations, small holes and cracks, and difficulties in meeting flame-retardant plastics.

Inactive Publication Date: 2014-01-22
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing flame-retardant polypropylene / thermoplastic polyurethane elastomer material uses a single expandable graphite, and the barrier carbon layer formed after the material is burned has low strength, is brittle, and has small holes and cracks, making it difficult to achieve vertical Burning UL-94V-0 grade, it is difficult to meet the requirements of flame-retardant plastics, so its application is limited

Method used

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  • Preparation method of halogen-free composite flame retardant polypropylene/thermoplastic polyurethane elastomer composite material
  • Preparation method of halogen-free composite flame retardant polypropylene/thermoplastic polyurethane elastomer composite material
  • Preparation method of halogen-free composite flame retardant polypropylene/thermoplastic polyurethane elastomer composite material

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Embodiment 1

[0021] A preparation method of a halogen-free composite flame-retardant polypropylene / thermoplastic polyurethane elastomer composite material, the specific method of which is:

[0022] A. After fully mixing 80 parts of weight of dry polypropylene, 20 parts of weight of dry thermoplastic polyurethane elastomer, 3 parts of weight of dry polypropylene grafted maleic anhydride and 0.2 parts of antioxidant in a mixer, use Twin-screw extruder for mixing and granulation, the temperature range of the extruder barrel is 180-230°C (the temperature of the feeding section of the extruder barrel is 180°C, the temperature of the outlet section of the die is 230°C), and the screw speed is 150rpm , to obtain modified polypropylene masterbatch after drying;

[0023] B, then fully mix 100 parts by weight of modified polypropylene masterbatch, 15 parts by weight of modified expandable graphite, and 5 parts by weight of red phosphorus flame-retardant masterbatch to obtain a mixture; wherein the m...

Embodiment 2

[0025] A preparation method of a halogen-free composite flame-retardant polypropylene / thermoplastic polyurethane elastomer composite material, the specific method of which is:

[0026] A. After fully mixing 80 parts of weight of dry polypropylene, 20 parts of weight of dry thermoplastic polyurethane elastomer, 3 parts of weight of dry polypropylene grafted maleic anhydride and 0.2 parts of antioxidant in a mixer, use Twin-screw extruder for mixing and granulation, the temperature range of the extruder is 180-230°C, the screw speed is 160rpm, and the modified polypropylene masterbatch is obtained after drying;

[0027] B, then fully mix 100 parts by weight of modified polypropylene masterbatch, 13.3 parts by weight of modified expandable graphite, and 6.7 parts by weight of red phosphorus flame-retardant masterbatch to obtain a mixture; wherein the modified expandable graphite is The expandable graphite is obtained by surface modification with a silane coupling agent, and its a...

Embodiment 3

[0029] A preparation method of a halogen-free composite flame-retardant polypropylene / thermoplastic polyurethane elastomer composite material, the specific method of which is:

[0030] A, after fully mixing the dry polypropylene of 80 parts by weight, the dry thermoplastic polyurethane elastomer of 20 parts by weight, the dry polypropylene grafted maleic anhydride of 3 parts by weight and the antioxidant of 0.2 parts by weight in the mixer, use Twin-screw extruder for mixing and granulation, the extruder barrel temperature range is 180-230°C, the screw speed is 170rpm, and the modified polypropylene masterbatch is obtained after drying;

[0031] B, then fully mix 100 parts by weight of modified polypropylene masterbatch, 10 parts by weight of modified expandable graphite, and 10 parts by weight of red phosphorus flame-retardant masterbatch to obtain a mixture; wherein the modified expandable graphite is The expandable graphite is obtained by surface modification with a silane ...

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Abstract

The invention discloses a preparation method of a halogen-free composite flame retardant polypropylene / thermoplastic polyurethane elastomer composite material. The method mainly consists of: A. mixing 80 parts by weight of polypropylene, 20 parts by weight of a thermoplastic polyurethane elastomer, 3 parts by weight of dry polypropylene grafted maleic anhydride and 0.2 part by weight of an antioxidant fully, then employing a double-screw extruder to perform mixing and granulating, and conducting drying to obtain a modified polypropylene masterbatch; B. then fully mixing 100 parts by weight of modified polypropylene masterbatches, 6.7-15 parts by weight of modified expandable graphite, and 4-13.3 parts by weight of red phosphorus flame retardant masterbatches to obtain a mixture; and then subjecting the mixture to mixing and granulating by the double-screw extruder, drying the extruded granules, and then carrying out injection molding by an injection molding machine, thus obtaining the halogen-free composite flame retardant polypropylene / thermoplastic polyurethane elastomer composite material. The flame retardant polypropylene / thermoplastic polyurethane elastomer composite material prepared by the method has good flame retardance, and the flame retardant level can reach vertical burning UL-94V-0.

Description

technical field [0001] The invention relates to a preparation method of a halogen-free composite flame-retardant polypropylene / thermoplastic polyurethane elastomer composite material. Background technique [0002] Polypropylene is a thermoplastic with excellent comprehensive properties and widely used in industries such as electronic appliances, instruments and meters, automobiles and construction. However, the low impact strength of polypropylene, especially its brittleness at low temperature, limits its application fields. Thermoplastic polyurethane elastomers have excellent impact resistance, shock absorption, water resistance and oil resistance. The polypropylene / thermoplastic polyurethane elastomer obtained by blending the two has good comprehensive mechanical properties and expanded application fields. However, polypropylene / thermoplastic polyurethane elastomer is extremely flammable, and emits a large amount of dense smoke and toxic gas during the combustion process...

Claims

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Application Information

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IPC IPC(8): B29B9/12B29B9/10B29B7/00B29B9/06C08L23/12C08L75/04C08L51/06C08K9/10C08K9/06C08K7/24C08K3/04C08K3/02C08K3/32C08J3/22
Inventor 陈晓浪徐阳陈漫马永红孙志丹何玮頔
Owner SOUTHWEST JIAOTONG UNIV
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