Method for preparing composite talcum powder filled material of polypropylene

A composite material, polypropylene technology, applied in the field of preparation of talc powder filled polypropylene composite materials, can solve the problems of material toughness reduction, low shrinkage, high heat distortion temperature, etc., to achieve improved modulus and toughness, convenient operation, high performance stable effect

Inactive Publication Date: 2007-12-26
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Talc powder filled PP composite materials have been widely used in the production of automotive parts and daily necessities. Compared with PP without talc powder, its products have good appearance quality, low shrinkage and higher heat distortion temperature. However, due to The affinity of the two-phase interface is not strong, and the direct filling of talc powder often leads to the decline of some mechanical properties, which limits the application of composite materials
Surface modification of talc powder or addition of MAH-g-PP can effectively improve the interfacial force between talc powder and PP, improve the dispersion state of talc powder in PP, and thus improve the strength and stiffness of the composite material. The toughness of the material is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0012] According to the formula in Table-1, at a temperature of 190 ° C, first add polypropylene to the internal mixer or open mill, and then add maleic anhydride grafted PP (MAH-g-PP) and epoxy resin in sequence (bisphenol A diglycidyl ether type, brand: DGEBA), talcum powder, 2-ethyl-4-methylimidazole (EMI-2, 4), the epoxy resin undergoes a curing reaction during the blending process, and the poly Interfacial interaction between propylene and talc. The obtained composite material was molded into a sheet with a flat vulcanizing machine. The splines are cut according to the standard size, and the samples are tested according to ASTM D638, ASTM D790, ASTM D256 standards for tensile, bending, impact and other performance indicators. The test results are shown in Table-1.

[0013] Table 1

[0014] Example

[0015] It can be seen from Table-1 that the impact strength, tensile strength and flexural modulus are all significantly improved when MAH-g-PP is added to the PP...

Embodiment 6-14

[0017] According to the formula in Table-2, at a temperature of 190 ° C, first add polypropylene to the internal mixer or open mill, and then add maleic anhydride grafted PP (MAH-g-PP) and epoxy resin in sequence (Bisphenol A diglycidyl ether type, brand name: DGEBA), talcum powder, dicyandiamide curing agent, and epoxy resin is dynamically cured during the blending process. Sample preparation and testing standards were operated according to Examples 1-5. The test results are shown in Table-2.

[0018] Table 2

[0019] Example

[0020] It can be seen from Table-2 that with the increase in the amount of epoxy resin, the impact strength, tensile strength, and flexural modulus of the composite material increase significantly, and the elongation at break decreases slightly. When the amount of epoxy resin exceeds 5 phr, the elongation at break of the composite decreases significantly, but the tensile strength and flexural modulus continue to increase. This shows that w...

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PUM

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Abstract

This invention relates to a method for preparing talcum powder-filled polypropylene composite material. The method comprises: adding maleic anhydride-grafted polypropylene, talcum powder, epoxy resin and curing agent to polypropylene resin in an internal mixer, open mill or screw extruder at a certain blending temperature, blending, and curing epoxy resin in situ. The interfacial force between epoxy resin and polypropylene or talcum powder increased, and the mechanical properties of the obtained composite material are obviously improved. Compared with traditional surface treatment of talcum powder with coupling agent, or the addition of compatibilizer, the talcum powder-filled polypropylene composite material in this invention has improved rigidity and toughness. The method has such advantages as simple process, high processability and high adaptability. The talcum powder-filled polypropylene composite material can be used in buildings, automobile fittings and electric appliances.

Description

technical field [0001] The invention relates to a preparation method of a polypropylene composite material filled with talc powder, adding polypropylene grafted with maleic anhydride as a compatibilizer, and increasing the interface force between polypropylene and talc powder through dynamic curing of epoxy resin, so that The mechanical properties of composite materials have been significantly improved. The prepared composite material can be used as materials for civil construction, auto parts, household appliances and the like. Background technique [0002] Polypropylene (PP) filled with inorganic fillers can reduce material costs, improve the mechanical properties and thermal stability of materials, and improve the dimensional stability of products. Due to the lack of polarity of the macromolecular chain of PP, when blended with inorganic fillers, the compatibility is poor, the mutual dispersion is not good, the interface adhesion is low, and the phenomenon of phase separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K5/3445B29C47/00C08L51/06C08L63/02C08K3/34C08K5/24
Inventor 江学良孙康张勇张隐西
Owner SHANGHAI JIAO TONG UNIV
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