Continuous oriented glass fiber-reinforced high-flame retardance and low-water absorption rate sheet molding compound and preparation method thereof

A technology of sheet molding compound and glass fiber, which is applied in the field of composite materials, can solve the problems of heavy weight, low water absorption performance, and no materials involved, and achieve the effect of high addition, high flame retardancy, and improved mechanical properties

Inactive Publication Date: 2017-12-15
ZHENSHI GRP HUAMEI NEW MATERIALS
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  • Abstract
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  • Claims
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Problems solved by technology

Although the continuously oriented glass fiber reinforced unsaturated polyester sheet molding compound provided by this patent is reinforced with continuous oriented glass fiber, it focuses on the improvement of the material preparation process, and uses flame retardant fillers in the preparation, and does not involve the low water absorption of the material. At the same time, the description of the flame retardant characteristics does not correspond to the flame retardant grade listed in the US UL-94 standard.

Method used

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  • Continuous oriented glass fiber-reinforced high-flame retardance and low-water absorption rate sheet molding compound and preparation method thereof

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preparation example Construction

[0033] In this embodiment, a method for preparing a continuously oriented glass fiber reinforced sheet molding compound with high flame retardancy and low water absorption comprises the following steps:

[0034] a. Weigh the unsaturated polyester resin, low shrinkage agent, styrene, filler, initiator, polymerization inhibitor, internal mold release agent and processing aid according to a certain proportion, and fully stir and mix to obtain a resin paste;

[0035] b. Mixing the thickener with the carrier resin to obtain a thickener paste;

[0036] c. The resin paste and the thickener paste are mixed through the online mixing system of the sheet molding compound production unit, and then compounded with continuous oriented glass fiber and chopped glass fiber, and the sheet is obtained through the process of impregnation and compaction;

[0037] d. Place the sheet at a certain temperature to mature, and when the indentation hardness reaches a certain range, a continuously oriente...

Embodiment 1

[0039] Prepare 37 kg of isophthalic resin, 13 kg of polymethyl methacrylate, 2 kg of polyethylene micropowder, 1.5 kg of styrene, 75 kg of aluminum hydroxide, 42.5 kg of glass fiber (oriented continuous fiber and short fiber with a chopped length of 25.4 mm The ratio is 5:1), tert-butyl peroxybenzoate 0.65 kg, p-benzoquinone 0.02 kg, magnesium oxide 0.60 kg, zinc stearate 2.2 kg, BYK996 additive 0.5 kg, BYK972 additive 0.4 kg.

[0040]The above chemical raw materials except the thickener paste are weighed according to a predetermined ratio and fully mixed with a high-speed mixer to obtain a resin paste with a viscosity of about 120 P; the resin paste and the thickener paste are passed through the sheet molding compound production unit Mixed in an online mixing system, compounded with continuous oriented glass fiber and chopped glass fiber, and then impregnated and compacted to obtain a sheet molding compound sheet; place the sheet at 45°C for curing until the hardness reaches 3...

Embodiment 2

[0042] Prepare 34 kg of vinyl ester resin, 16 kg of polystyrene, 2.5 kg of polyethylene micropowder, 2.5 kg of styrene, 85 kg of aluminum hydroxide, and 41 kg of glass fiber (the ratio of oriented continuous fiber to short fiber with a chopped length of 25.4 mm 4:2), tert-butyl peroxyisopropyl carbonate 0.5 kg, p-benzoquinone 0.01 kg, magnesium oxide 0.55 kg, zinc stearate 2.5 kg, BYK996 additive 1.0 kg, BYK972 additive 0.5 kg.

[0043] Weigh the above chemical raw materials except the thickener paste according to a predetermined ratio and fully mix them with a high-speed mixer to obtain a resin paste with a viscosity of about 105 P; pass the resin paste and thickener paste through the sheet molding compound production unit Mixed in an online mixing system, compounded with continuous oriented glass fiber and chopped glass fiber, and then impregnated and compacted to obtain a sheet molding compound sheet; place the sheet at 45°C for curing until the hardness reaches 350-450 Aft...

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Abstract

The invention relates to a continuous oriented glass fiber-reinforced high-flame retardance and low-water absorption rate sheet molding compound and a preparation method thereof and belongs to the field of composite materials. The molding compound comprises the following matters in parts by weight: 60-90 parts of unsaturated polyester resin, 10-40 parts of a low shrinkage agent, 0-10 parts of styrene, 100-200 parts of a filler, 60-120 parts of glass fiber, 0.5-2.0 parts of an initiating agent, 0-0.1 part of a polymerization inhibitor, 0.5-2.0 parts of a thickening agent, 2-6 parts of an internal releasing agent and 0-4 parts of a processing aid. Compared with a conventional full chopped glass fiber reinforced sheet molding compound, the continuous oriented glass fiber-reinforced high-flame retardance and low-water absorption rate sheet molding compound has the benefits that under the situation that the mass fraction of the glass fiber is not improved, chopped glass fiber in the continuous oriented glass fiber matching part is used as a reinforcing material, so that the mechanical properties of the material are significantly improved; the material flame-retardant grade achieves UL-94 VO, and the water absorption rate is less than 0.15 percent; the invention provides the preparation method of the continuous oriented glass fiber-reinforced high-flame retardance and low-water absorption rate sheet molding compound.

Description

technical field [0001] The invention relates to a molding compound and a preparation method, in particular to a continuously oriented glass fiber-reinforced high flame retardant and low water absorption sheet molding compound and a preparation method thereof, belonging to the field of composite materials. Background technique [0002] In recent years, glass fiber reinforced composites have been more and more widely used in daily life due to their light weight and high strength. Among them, the sheet molding compound (Sheet Molding Compound, SMC) technology has become the current glass industry because of its characteristics of forming products with complex and fine structures at one time, high production efficiency, and formula design according to needs to obtain products with specific needs. One of the most important molding processes for fiber-reinforced thermosetting composites. This technology originated in the Federal Republic of Germany in the 1960s. Its main chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/06C08L33/12C08L23/06C08K13/04C08K5/01C08K3/22C08K7/14C08K5/14C08K5/098
CPCC08L67/06C08K2003/222C08K2003/2227C08K2003/265C08L2201/02C08L2205/03C08L33/12C08L23/06C08K13/04C08K5/01C08K3/22C08K7/14C08K5/14C08K5/098C08L25/06C08K3/26
Inventor 杨国刚朱一张健侃许贤彬
Owner ZHENSHI GRP HUAMEI NEW MATERIALS
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