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Nano cellulose reinforced polypropylene foam material and preparation method thereof

A technology of nanocellulose and foaming materials, applied in the field of nanocellulose reinforced polypropylene foaming materials and its preparation, polypropylene materials and its preparation, can solve the problems of easy formation of voids and defects, poor mechanical properties of composite materials, distribution Uniformity and other issues, to achieve the effect of promoting crystallization performance, improving foaming ability, and high modulus

Inactive Publication Date: 2019-02-19
合肥华聚微科新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the polarity of the cellulose surface, it is difficult to distribute evenly in a non-polar matrix such as polypropylene. resulting in poor mechanical properties of the resulting composite

Method used

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  • Nano cellulose reinforced polypropylene foam material and preparation method thereof
  • Nano cellulose reinforced polypropylene foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Dilute the bleached kraft pulp containing cellulose to a 2wt% slurry with distilled water, then use a ball mill to disperse the slurry at 30°C and a feed rate of 750ml / min to obtain a nanocellulose slurry.

[0046] (2) 40 parts of nanocellulose slurry, 0.2 part of maleic anhydride grafted polypropylene, and 97.8 parts of polypropylene with a number average molecular weight of 250,000 were melted together in a twin-screw extruder with a nanocellulose mass content of 5%. mixed to obtain a polypropylene / cellulose composite material with a nanocellulose content of 1%.

[0047] (3) The composite material is placed in the first-stage twin-screw extruder, the melting temperature is 170-230 ° C, the screw speed is 15 r / min, and 9.78 parts of nitrogen (1% of the polypropylene mass) is extruded The metering pump at the gas injection port on the machine feeds into the screw, mixes evenly, and obtains a single-phase polymer / gas melt.

[0048] (4) Import the single-phase polyme...

Embodiment 2

[0051] (1) Dilute the bleached kraft pulp containing cellulose to a 2wt% slurry with distilled water, then use a ball mill to disperse the slurry at 40°C and a feed rate of 700ml / min to obtain a nanocellulose slurry.

[0052] (2) 97.8 parts of 97.8 parts of polypropylene with 350,000 number average molecular weights of 40 parts of nanocellulose slurry, 0.2 parts of maleic anhydride grafted polypropylene, and 350,000 number average molecular weights were melted in a twin-screw extruder mixed to obtain a polypropylene / cellulose composite material with a nanocellulose content of 1%.

[0053] (3) Put the composite material in the first-stage twin-screw extruder, the melting temperature is 170-230°C, the screw speed is 20r / min, and at the same time, 1.956 parts of nitrogen gas is pumped from the gas injection port on the extruder Input into the screw, mix evenly to obtain a single-phase polymer / gas melt.

[0054] (4) Import the single-phase polymer / gas melt into the second-stage s...

Embodiment 3

[0057] (1) Dilute the bleached kraft pulp containing cellulose to a 2wt% slurry with distilled water, then use a ball mill to disperse the slurry at 40°C and a feed rate of 700ml / min to obtain a nanocellulose slurry.

[0058] (2) 97.8 parts of 450,000 polypropylenes with a nanocellulose mass content of 40 parts of nanocellulose slurry, 0.2 parts of maleic anhydride grafted polypropylene and number average molecular weight of 450,000 were melted in a twin-screw extruder mixed to obtain a polypropylene / cellulose composite material with a nanocellulose content of 1%.

[0059] (3) Put the composite material in the first-stage twin-screw extruder, the melting temperature is 170-230°C, the screw speed is 25r / min, and at the same time, 2.934 parts of nitrogen are fed into the screw by the gas injection port metering pump on the extruder Inside, mix uniformly to obtain a single-phase polymer / gas melt.

[0060] (4) Introduce the single-phase polymer / gas melt into the second-stage sing...

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Abstract

The invention discloses a nano cellulose reinforced polypropylene foam material and a preparation method thereof. The nano cellulose reinforced polypropylene foam material is prepared from, by weight,88-97.8 parts of polypropylene, 2-10 parts of cellulose, 0.2-2 parts of a compatibilizer and supercritical fluid 1-10% of the weight of polypropylene. By adoption of maleic anhydride grafted polypropylene as the compatibilizer for improving an interface of polypropylene and nano cellulose, high strength and high modulus of a composite material are achieved; further, the nano cellulose forms a filler network in polypropylene to improve polypropylene melt strength and can also serve as a polypropylene crystal nucleating agent to improve polypropylene foaming capacity. A polypropylene / nano cellulose composite material is prepared according to an extrusion blending method, and technical simplicity and suitableness for large-batch industrial production are realized.

Description

technical field [0001] The invention relates to a polypropylene material and a preparation method thereof, in particular to a nano-cellulose reinforced polypropylene foam material and a preparation method thereof, belonging to the field of polymer material processing. Background technique [0002] Foam plastic is a polymer-based microporous material containing a large amount of gas inside. It is a special solid / gas composite material. Compared with unfoamed plastics, foamed plastics have the characteristics of light weight, sound insulation, heat insulation, high specific strength, high impact strength and strong absorption capacity, so they are widely used in packaging industry, automobile industry, transportation industry, daily necessities, military industry, Sports equipment and construction are widely used. At present, the most widely used foam plastics mainly include expanded polystyrene (PS), expanded polyurethane (PU) and expanded polyolefin plastics. Hydrochlorofl...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L1/04C08L51/06C08J9/12
CPCC08J9/0061C08J9/122C08J2323/12C08J2401/04C08J2451/06
Inventor 汪龙汪彪
Owner 合肥华聚微科新材料有限责任公司
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