Preparation method of non-directional chopped fiber reinforced polypropylene material
A technology of polypropylene material and chopped fiber, which is applied in the field of polypropylene material to achieve the effects of excellent mechanical properties, uniform fiber length and outstanding fluidity
Pending Publication Date: 2021-06-04
江苏易塑复合新材料有限公司
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Problems solved by technology
[0003] The invention provides a method for preparing non-oriented chopped fiber reinforced polypropylene material to solve the defects in the prior art
Method used
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[0026] Step 1: Accurately weigh the polypropylene, compatibilizer, antioxidant, and flame retardant, and then melt and extrude it through twin-screw equipment. Part of the prepared molten material is coated on the Teflon anti-stick belt. The belt running speed 5m / min, coating unit area weight 150g / ㎡;
[0027] Step 2: Sprinkle and settle the special thermoplastic glass fiber yarn on the resin film through the chopping equipment, the chopped length is 15mm, and the weight per unit area of the fiber is 300g / ㎡;
[0028] Step 3: Extrude another part of the molten material obtained in step 1 to coat the upper layer of chopped glass fiber, and the weight per unit area of the coat is 150g / ㎡;
[0029] Step 4: Use special hot-press impregnation and shaping equipment to impregnate and cool the sheet to a thickness of 0.5mm, and the weight per unit area of the sheet is 500g / ㎡;
[0030] Step 5: The material with a unit weight of 800g / ㎡ and a thickness of 4mm is used as the skin, and...
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Abstract
A preparation method of a non-directional chopped fiber reinforced polypropylene material comprises the following steps that Step 1, polypropylene, a compatilizer, an antioxidant and a flame retardant are accurately weighed and fully mixed, melt extrusion is performed through twin-screw equipment, and one part of the prepared melt material is laminated to a Teflon anti-sticking belt; Step 2, special thermoplastic glass fiber yarn is chopped, thrown, settled and laid on a resin film; Step 3, the other part of the melt material obtained in Step 1 is extruded and laminated to the upper layer of chopped glass fibers; Step 4, dipping, cooling and sizing are performed through special hot-pressing dipping and sizing equipment; and Step 5, cutting and rolling are performed. The product prepared by the method has the advantages that the chopped glass fibers are uniformly dispersed in the polypropylene, the fiber length is uniform, the mechanical property is excellent, the product can be thermally compounded to produce a solid core plate, the product can be used as a high-strength wrapper to produce a sandwich plate which is directly used as a light substitute for various wood and steel plates, the product is outstanding in flowability after being heated and melted as a die-pressing material, and the product is particularly suitable for production of complex specially-shaped die-pressing machine components.
Description
technical field [0001] The invention belongs to the field of polypropylene materials, in particular to a preparation method of non-oriented chopped fiber reinforced polypropylene materials. Background technique [0002] SMC composite material is molded at one time at high temperature, with high mechanical strength, light material weight, corrosion resistance, long service life, high dielectric strength, arc resistance, flame retardancy, good sealing performance, flexible product design, and easy large-scale production. And has the advantages of safety and beauty, with all-weather protection function, can meet the needs of various harsh environments and places in outdoor engineering projects, overcome the defects of easy corrosion, short life and poor heat insulation performance of outdoor metal equipment boxes, widely used Used in telecommunications, electric power and railways and other fields. However, SMC composite materials have the following defects: 1. SMC materials a...
Claims
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IPC IPC(8): B29C70/28C08L23/12C08L51/06C08K5/134C08K5/526C08J5/18
CPCB29C70/28C08J5/18C08J2323/12C08J2451/06C08K5/1345C08K5/526
Inventor 陈伟鹏白晓伟杨磊杨思敏顾清波
Owner 江苏易塑复合新材料有限公司