Long glass fiber reinforced polypropylene composite material and preparation method thereof

A technology of long glass fiber and composite sheet, which is applied in the field of long glass fiber reinforced polypropylene composite sheet and its preparation, can solve the problem that it is not suitable for preparing reinforced particles of heat-sensitive system, and it is not suitable for preparing high-viscosity PP/LGF. , It is difficult to achieve the monofilament-level dispersion impregnation effect, etc., to achieve the effect of shortening the production cycle, improving stiffness and high production efficiency

Inactive Publication Date: 2012-01-11
无锡利保科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The survey results show that the impregnation and dispersion effects of the current impregnation and extrusion technology as a whole are not ideal, and it is difficult to achieve single-filament level dispersion and good impregnation effects only by wave or gear train structure
[0007] 2. Not suitable for preparing high viscosity PP / LGF
For high-viscosity resins with a melt index of 10-20g / 10min or less, the current impregnation technology is difficult to achieve single-slit level dispersion and good impregnation effect
[0008] 3. Not suitable for the preparation of LFT for heat sensitive systems
However, the structure adopted by the current impregnation mold has more base materials in the mold, which can easily cause material degradation, so it is not suitable for the preparation of reinforced particles of heat-sensitive systems, such as POM / LGF
In addition, the viscosity of POM is high, and the current impregnation technology is difficult to achieve ideal impregnation and dispersion
Therefore, the current dipping and extrusion dies are specific and not universal
[0009] In addition, the finished material needs to undergo secondary molding, the cost is high, and the processing flexibility is not enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take 50% polypropylene (unit is percentage by weight), 45% long glass fiber, 0.3% NH 2 CH 2 SiOCH 3 , 1% maleic anhydride grafted polypropylene, 1% copolymerized polypropylene, 1% polyolefin elastomer, 0.7% diphenylamine (aromatic amine antioxidant) and 1% talcum powder, the long glass The fiber is preheated to 150-200°C, and the other components are mixed evenly; the mixture is added to the No. 1 twin-screw extruder, and the processing temperature is 180-240°C; The body is injected into the No. 2 twin-screw extruder, and the long glass fiber that has been preheated and dispersed is introduced at the same time. The processing temperature is 180-240°C; after heating, the mixture in the No. 2 twin-screw extruder is extruded, and then The four-wheel pressure roller presses it into a sheet with a thickness of 2 to 5 mm, that is, forming.

Embodiment 2

[0036] Take 55% polypropylene (unit is percentage by weight), 38% long glass fiber, 0.5% CH 2 CH(CH)2SiCl, 2% maleic anhydride grafted polypropylene, 2% copolymerized polypropylene, 0.5% styrene block copolymer and 2% tert-butyl hydrodiphenol (hindered phenolic antioxidant ), preheat the long glass fibers to 150-200°C, and mix the other components evenly; add the mixture into the No. The extruded mixed melt is injected into the No. 2 twin-screw extruder, and the long glass fiber that has been preheated and dispersed is introduced at the same time. The processing temperature is 180-240°C; after heating, the mixture in the No. It is extruded and then pressed into a sheet with a thickness of 2 to 5 mm by four rollers, that is, forming.

Embodiment 3

[0038] Take 60% polypropylene (unit is percentage by weight), 32% long glass fiber, 1% H 2 C(O)CHCH 2 SiOC 2 h 5 , 1% maleic anhydride grafted polypropylene, 2% copolymerized polypropylene, 2% thiodipropionate diester (auxiliary antioxidant) and 2% calcium carbonate, preheat the long glass fiber to 150 ~200℃, mix other components evenly; add the mixture into the No. 1 twin-screw extruder, and the processing temperature is 180-240℃; The screw extruder introduces long glass fibers that have been preheated and dispersed at the same time, and the processing temperature is 180-240°C; after heating, the mixture in the No. 2 twin-screw extruder is extruded, and then compressed It is pressed into a sheet with a thickness of 2 to 5 mm, that is, shaped.

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PUM

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Abstract

The invention discloses a long glass fiber reinforced polypropylene composite material, which comprises the following ingredients by weight percentage: 55-70% of polypropylene, 45-30% of long glass fiber, 0.3-1% of coupling agent,0-10% of MPP compatilizer, 0-15% of propylene copolymer, 0-5% of flexibilizer, 0.3-0.6% of anti-oxidant and 0-20% of filling materials. Simultaneously, the invention discloses a method for preparing the composite material. The invention uses a direct method for preparing the long glass fiber reinforced polypropylene composite material, which simplifies the technical links of cooling, solidifying heating and melting of prepreg, so that the long glass fiber reinforced polypropylene composite material saves the energy consumption, reduces the cost, and the production process is flexible.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a long glass fiber reinforced polypropylene composite sheet and a preparation method thereof. Background technique [0002] Glass fiber reinforced polypropylene composite material is referred to as LFT, which not only has high strength, low density (only 1 / 5~1 / 7 of metal), excellent corrosion resistance, good formability, clean operating process environment, waste and The product can be recycled and reused. It also has high specific strength and impact strength, good thermal performance, insulation performance and heat insulation effect, and can be used in the atmosphere for a long time. It is a green environmental protection material with low energy consumption and no environmental pollution. , Play an important role in automobile lightweight and environmental protection. In the automotive industry and many fields, under the situation of urgent requirement...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L51/06C08L23/00C08L53/00C08L23/06C08L23/16C08K13/04C08K7/14C08K5/544C08K5/54C08K5/5419C08K5/548C08J5/08
Inventor 吕国君吕翰旭
Owner 无锡利保科技发展有限公司
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