Natural fiber reinforcement halogen-free flame retardant polypropylene composite material and preparation method thereof

A flame-retardant polypropylene and natural fiber technology, applied in the field of polypropylene composite materials and their preparation, natural fiber reinforced halogen-free flame-retardant polypropylene composite materials and their preparation, can solve problems such as exceeding the specific modulus, and achieve low shrinkage High efficiency, good comprehensive mechanical properties, excellent flame retardant effect

Inactive Publication Date: 2009-04-29
SHANGHAI KINGFA SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a reinforcing agent, although the specific strength of these fibers is 50%-80% of glass fibers, the specific modulus exceeds that of glass fibers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 82.5 parts by weight of polypropylene with a molecular weight of 100,000, heat stabilizer 1,3,5-trimethyl-2,4,6-three (3,5-di-tert-butyl-4-hydroxybenzyl) Benzene (trade name Irganox1010, produced by Switzerland Ciba Specialty Chemical Co., Ltd.) 0.3 parts by weight, processing aid butyl stearate 0.2 parts by weight, toughening agent ethylene-propylene-butadiene terpolymer 1 parts by weight, 10 parts by weight of flame retardant ammonium polyphosphate and 1 part by weight of glass fiber compatibilizer glycidyl methacrylate (GMA) grafted polypropylene were melt-mixed in a twin-screw extruder with an aspect ratio of 45:1 Dispersion, 5 parts by weight of flax fiber is fed from the side, extruded and granulated, and the extrusion process is: 1 zone 170-180 ℃, 2 zone 180-190 ℃, 3 zone 190-200 ℃, 4 zone 190-200 ℃, screw speed 350-400r / min, feeding frequency 10-25Hz, vacuum degree -0.04—0.07MPa.

[0038] The above products have excellent flame retardant effect and good compreh...

Embodiment 2

[0040]12 weight parts of polypropylene with a molecular weight of 200,000, 2 weight parts of heat stabilizer bisphenol A, 1 weight part of processing aid monoglyceride stearate, and 10 weight parts of a copolymer of toughening agent styrene and butadiene part, 40 parts by weight of flame retardant pentaerythritol, 5 parts by weight of glass fiber compatibilizer maleic anhydride grafted polyethylene in the twin-screw extruder that length-diameter ratio is 35:1 melt mixing dispersion, 30 parts by weight of hemp fiber from Side feeding, extrusion granulation, the extrusion process is: 1st zone 200-210°C, 2nd zone 210-220°C, 3rd zone 220-230°C, 4th zone 230-240°C, screw speed 350-400r / min, feeding frequency 10-25Hz, vacuum degree -0.04—0.07MPa.

[0041] The above products have excellent flame retardant effect and good comprehensive mechanical properties. The heat distortion temperature is 140°C (ISO75 / 1-93, 1.82MPa), the tensile strength is 58MPa (ISO527 / 2-93), and the elongation...

Embodiment 3

[0043] 41 parts by weight of polypropylene with a molecular weight of 150,000, 0.3 parts by weight of heat stabilizer bisphenol C, 0.2 parts by weight of glyceryl tristearate as a processing aid, and a copolymer of styrene and butadiene as a toughening agent 10 parts by weight, 21.5 parts by weight of flame retardant dipentaerythritol, 2 parts by weight of glass fiber compatibilizer fumaric acid grafted polypropylene, melted, mixed and dispersed in a twin-screw extruder with an aspect ratio of 40:1, jute fiber 25 Parts by weight are fed from the side, extruded and granulated, and the extrusion process is: 180-190°C in the first zone, 190-200°C in the second zone, 190-200°C in the third zone, 190-200°C in the fourth zone, and the screw speed is 350 -400r / min, feeding frequency 10-25Hz, vacuum degree -0.04—0.07MPa.

[0044] The above-mentioned products have excellent flame retardant effect and good comprehensive mechanical properties. (ISO527 / 2-93) is 7%, injection shrinkage (A...

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Abstract

The invention provides a natural fiber reinforced halogen-free flame-retardant polypropylene composite material, which is characterized by consisting of the following raw materials in weight portion: 82.5 to 12 portions of polypropylene, 0.3 to 2 portions of heat stabilizer, 0.2 to 1 portion of processing assistant, 1 to 10 portions of toughening agent, 10 to 40 portions of flame retardant, 1 to 5 portions of compatilizer, and 5 to 30 portions of natural fiber. The invention also provides a method for preparing the material. The composite material has the advantages that the composite material has excellent flame-retardant effect and excellent comprehensive mechanical property; the flame-retardant property of the composite material can reach 1.6mm V0; the tensile strength is more than or equal to 60MPa; the bending modulus is more than or equal to 4,000MPa; the gap impact strength is more than or equal to 10KJ / m<2>; the shrinkage ratio is between 4 and 6 per thousand; the heat distortion temperature is more than or equal to 140 DEG C; and the composite material is a novel environment-friendly material, and has no safety and health problems of glass fibers.

Description

technical field [0001] The invention relates to a natural fiber-reinforced halogen-free flame-retardant polypropylene composite material and a preparation method thereof, in particular to a polypropylene composite material with high flame retardancy, low shrinkage rate and excellent comprehensive mechanical properties used in the field of household appliances and its preparation The method belongs to the technical field of polymer materials. Background technique [0002] Polypropylene (PP) is one of the five general-purpose plastics with a density of 0.90g / cm 3 . Because of its good performance, small specific gravity, and easy processing and molding, it is widely used in the automobile industry, household appliances, textile industry, electronic instrument industry, etc. However, because the limiting oxygen index of polypropylene resin is very low, only 18, it is a flammable material, which cannot meet the requirements for the use of specific materials in the field of fir...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08J5/04C08K13/02C08K5/13C08K5/101C08K3/32C08K5/00B29B9/00B29C47/92B29C47/10B29C48/92
CPCB29C48/92B29C2948/92704B29C2948/92895
Inventor 孙刚易庆锋王灿耀吉继亮苏妤
Owner SHANGHAI KINGFA SCI & TECH
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