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High-size-stability long glass fiber reinforced polypropylene composite material and preparation method thereof

A technology with long glass fibers and dimensional stability, applied in the field of polypropylene composite materials, can solve problems such as residual internal stress, easy warping of parts, chaotic distribution of glass fibers, etc., and achieve good mechanical properties and excellent heat resistance , The effect of simplification of processing technology

Inactive Publication Date: 2017-04-26
SHANGHAI PRET COMPOSITES +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, after the long glass fiber reinforced polypropylene material is injection molded into parts, due to the uneven orientation of the long glass fibers in the part, the distribution of glass fibers in the flow direction and the vertical flow direction is relatively chaotic, so the molding shrinkage in both directions Different ratios, resulting in some parts (especially large-area flat parts, etc.) prone to warping, etc.
In addition, at a higher processing temperature, the long glass fiber and the molten resin wrapped on the surface can be fully mixed, but in the normal production cycle of parts, in order to ensure the supply rhythm, the cooling time is limited, and the composite material structure is easy to cause A large amount of residual internal stress makes it shrink unevenly in all directions
Therefore, in the injection molding process, if a high proportion of reinforcing phase / filling phase materials, such as glass fiber, carbon fiber or other filling phase materials, cannot be cooled uniformly and slowly, polymer substrates with different crystallinity will be formed rapidly. , especially when the reinforcement ratio is high and the molded product has a large wall thickness, it is easy to cause a large change in the size of the resulting reinforced composite material and a decrease in mechanical properties
[0005] For a long time, the dimensional stability and creep resistance of automotive structural parts made of long glass fiber reinforced materials have been more concerned issues in the industry. Since long glass fibers are polar materials with obvious orientation, their compatibility with non-polar matrix The compatibility of the resin is poor. Although a certain amount of compatibilizer is added to improve the bonding force between the two interfacial phases, uneven vertical and horizontal shrinkage, warping and other phenomena still occur from time to time, which greatly limits the long glass fiber. Application of reinforced polypropylene material, a cost-effective material, in automotive structural parts

Method used

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  • High-size-stability long glass fiber reinforced polypropylene composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Use the TE-65 (length-to-diameter ratio L / D=48) twin-screw extruder that has side feed port, add 1436 grams of polypropylene resin PP-1 at main feed port, add 20 grams at side feed port 40 grams of black mother, 40 grams of mica, 30 grams of antioxidant, 4 grams of l,4-(bis-tert-butylperoxy) dicumyl and 70 grams of glass fiber compatibilizer. The processing temperatures (from the feed port to the die) are: 150°C, 190°C, 200°C, 220°C, 240°C, 240°C, 260°C, 265°C, and the speed of the main machine is 350rpm.

[0043] The compound and the continuous glass fiber melted and reacted by the extruder adopt the pultrusion process, the impregnation temperature is 260°C, and the fiber weight percentage is 20% and the length is the same as the resin pellet. The long glass fiber reinforced PP pellets with the same material length were used to prepare standard mechanical test samples by injection molding machine. The test results are shown in Table 1.

Embodiment 2

[0045] Make use of the TE-65 (length-to-diameter ratio L / D=48) twin-screw extruder with side feed port, add 1416 grams of polypropylene resin PP-1 at the main feed port, add at the side feed port 20 grams of black mother, 60 grams of mica, 30 grams of antioxidant, 4 grams of l,4-(bis-tert-butylperoxy) dicumyl and 70 grams of glass fiber compatibilizer. The processing temperatures (from the feed port to the die) are: 150°C, 190°C, 200°C, 220°C, 240°C, 240°C, 260°C, 265°C, and the speed of the main machine is 350rpm.

[0046] The compound and the continuous glass fiber melted and reacted by the extruder adopt the pultrusion process, the impregnation temperature is 260°C, and the fiber weight percentage is 20% and the length is the same as the resin pellet. The long glass fiber reinforced PP pellets with the same material length were used to prepare standard mechanical test samples by injection molding machine. The test results are shown in Table 1.

Embodiment 3

[0048] Use the TE-65 (length-to-diameter ratio L / D=48) twin-screw extruder that has side feed port, add 1396 grams of polypropylene resin PP-1 at main feed port, add 20 grams at side feed port 1 gram of black mother, 80 grams of mica, 30 grams of antioxidant, 4 grams of l,4-(bis-tert-butylperoxy) dicumyl and 70 grams of glass fiber compatibilizer. The processing temperature (from the feed port to the die head) is: 150°C, 190°C, 200°C, 220°C, 240°C, 240°C, 260°C, 265°C, and the speed of the main machine is 350rpm.

[0049]The compound and the continuous glass fiber melted and reacted by the extruder adopt the pultrusion process, the impregnation temperature is 260°C, and the fiber weight percentage is 20% and the length is the same as the resin pellet. The long glass fiber reinforced PP pellets with the same material length were used to prepare standard mechanical test samples by injection molding machine. The test results are shown in Table 1.

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Abstract

The present invention discloses a high-size-stability long glass fiber reinforced polypropylene composite material and a preparation method thereof, wherein the raw materials comprise, by weight, 10-60% of long glass fiber, 40-90% of a modified polypropylene resin, 1-8% of a glass fiber compatibilizer, 1-5% of an inorganic filler, and 0.5-5% of an anti-oxidation auxiliary agent. According to the present invention, by adding the modified filler, the common warping phenomenon in the long glass fiber reinforced polypropylene product is alleviated, and the part obtained after the injection molding has advantages of high size stability and high-temperature-creep resistance; the product has characteristics of excellent apparent performance, no glass fiber exposing, excellent finish, excellent heat resistance, simplified processing process, and mold service lifer prolonging; and the product further has good mechanical properties such as excellent tension performance, excellent bending strength, and excellent impact resistance.

Description

technical field [0001] The invention relates to a polypropylene composite material, in particular to a high dimensional stability, long glass fiber reinforced polypropylene composite material and a manufacturing method thereof. Background technique [0002] Long glass fiber reinforced polypropylene material (PP-LGF) has good mechanical properties. Compared with nylon reinforced short fiber (PA6,6-GF) material, its dimensional stability is relatively good, and its mechanical properties can be compared with those in wet state. Comparable to PA6,6-GF material, it is cost-effective and can meet the mechanical performance requirements of many car interior parts, so it has great market development and application prospects. [0003] Long glass fiber reinforced thermoplastic resin is a reinforced thermoplastic resin in which the reinforcing fibers are arranged in one direction and the length is the same as that of the resin pellets. Compared with conventional short fiber reinforce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K13/04C08K7/14C08K5/14C08K3/04C08K3/34B29C70/52
CPCC08K13/04B29C70/52B29C70/528C08K3/04C08K3/34C08K5/14C08K7/14C08K2201/003C08L2201/08C08L23/12
Inventor 钟颖陈永东张祥福周文
Owner SHANGHAI PRET COMPOSITES
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