Method for manufacturing glass fibre reinforced thermoplastic sheet

Abstract

The invention discloses a method for manufacturing a glass fibre reinforced thermoplastic sheet, which comprises the following steps: (1) uncoiling and splitting glass fibres, namely splitting untwisted rough yarns; (2) soaking the glass fibres, namely uniformly and fully wetting flocculent foaming bodies obtained on the surfaces of the glass fibres; (3) dynamic powder adhering, namely atomizing mixed powder of the glass fibres and polypropylene (PP) so as to be uniformly adhered to the glass fibres; (4) slitting and gas-flow mixing, namely cutting the glass fibres obtained by the step (3), performing gas-flow mixing treatment on the cut glass fibres falling into a mixing chamber to prepare the mixed powder of the glass fibres and the polypropylene (PP), adding the powder into a deflection loosening chamber for loosening under the action of air flow, and dispersing the loosened powder onto a conveyor belt to form a blank felt; and (5) baking, compositing and shaping, namely baking the blank felt obtained by the step (4) at a high temperature for plasticizing, compositing and shaping the plasticized blank felt, and compositing an adhesive film and a non-woven fabric to form a sheet. The sheet has the advantages of no strength difference in the longitudinal and horizontal directions, obvious weight reducing and material reducing effect, high fire resistance, and recyclable leftovers and scraps in the production process.

Description

Technical field: [0001] The invention relates to the field of interior parts of automobiles and other vehicles, in particular to a production method of a glass fiber reinforced thermoplastic plate. Background technique: [0002] At present, the glass fiber reinforced thermoplastic sheet (Glass mat reinforced thermoplastics) commonly used in domestic and foreign automotive interiors, referred to as GMT sheet, due to the limitations of non-woven carding, laying, and needle-punched felt technology, the directionality of the glass fiber is limited. During the netting process, most of the orientation is transverse, so that the longitudinal and transverse strength ratio of the board is greater than 2 times; because the specific gravity difference between glass fiber and polypropylene (PP) fiber is large, the uniformity of the base mat is poor in the process of carding and laying. The average rate is 4% to 7%; the glass fiber is greatly damaged in the process of opening, carding, a...

AI Technical Summary

Problems solved by technology

[0002] At present, the glass fiber reinforced thermoplastic sheet (Glass mat reinforced thermoplastics) commonly used in domestic and foreign automotive interiors, referred to as GMT sheet, due to the limitations of non-woven carding, laying, and needle-punched felt technology, the directionality of the glass fiber is limited. During the netting process, most of the orientation is transverse, so that the longitudinal and transverse strength ratio of the board is greater than 2 times; because the specific gravity difference between glass fiber and polypropylene (PP) fiber is large, the uniformity of the base mat is poor in the process of carding and laying. The average rate is 4% to 7%; the glass fiber is greatly damaged in the process of opening, carding, and needle punching, which weakens the strength of the board; because the mixing and coating of polypropylene powder and polypropylene fiber and glass fiber are not uniform , can only meet the use requirements by increasing the content of polypropylene, resulting in higher cost of the board

At present, the GMT sheet produced by the domestic non-woven process cannot fully meet the quality requirements of automotive interior materials, such as high tensile, light weight, flame retardant, and environmental protection.

At present, the light glass fiber reinforced thermoplastic sheet (GMT) on the market, due to the difference in longitudinal and transverse strength, is still achieved by increasing the weight per unit area of ​​the material for high-stretch decorative parts, and the effect of light weight and material reduction is not significant; Combing the limitations of the needle-punching process, the raw materials of the needle-punched base felt are mixed with glass fiber and polypropylene (PP) fiber to form a network, it is difficult to add flame retardants, and the design of flame retardant and burning rate is limited to surface treatment in the board compounding process. The flame retardancy of the board is poor

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