Epoxy resin fiber molding compound to do

Epoxy resin fiber molding compound premix method is first manufacturing manufacturing fiber molding compound. Premixed method is chopped fibers with epoxy resin adhesive solution dipping and packing, then through blending to tear loose, drying and fiber was made by the mould plastic, this kind of molding compound is characterized by: fiber loose and astatic, good liquidity, production but can small; But the volume is big, fiber damage in the process of producing large, strength will reduce, poor working conditions. Can use the manual operation, each process is suitable for the small production and trial production; Also can use mechanical operation, suitable for mass production, manual operation is less fiber damage and products with high intensity. China epoxy resin industry association experts said, the preparation process should pay attention to the following: one is the fiber pretreatment enhanced infiltration agent processing should be adopted, otherwise need heat treatment method to remove paraffin infiltration agent on the surface of the fiber, the amount of residual oil is less than 0. 3%, it is not only trouble and fiber strength will reduce, short cut fiber, fiber length during mechanical premixed when no more than 20 ~ 40 mm, manual premixed no more than 30 ~ 60 mm, and the fiber volume; 2 it is matched with glue according to the formula to calculate a premixed feed rate, and used to adjust the volume of solvent adhesive solution with suitable viscosity, make after soaking and mixing with no residual adhesive solution in order to keep the mold plastic glue content, viscosity at high temperature in summer is usually a little bit small, winter low temperature viscosity should be bigger; Three is additive to prepare for other solid additives shall, in accordance with the provisions of fine grinding and sieving, drying to achieve indicator; Four is impregnated with mixed to make fully impregnated fiber and resin adhesive liquid filler and mixing, batch hours available hand rub repeatedly, when batch big z kneading machine can be used; Five is to tear loose, after mixing clouds of material or by hand to tear tear loose machine, soft, tear loose machine is mainly composed of the feed roller and a pair of hook tooth to tear loose roller, through to tear loose the inverse kinematics of roller and tore into material group loose; Six is drying will tear loose premix evenly on clean metal net, layer shoulds not be too thick ( Usually about 20 ~ 30 mm) To cool at room temperature, and most of the reentry after solvent evaporation drying process, and make the performed to a certain extent, oven temperature to 80 ℃, the drying time of 20 ~ 40 min; Seven is and batch, packaging after baked good molding compound should be rapidly cooled and batch, wrapped in a plastic bag. Method is another method of presoak manufacturing fiber molding compound, is the immersion method (the continuous fiber bundle the beam through the glue tank soak glue, drying, cutting and process manufacturing fiber molding compound method. The molding compound is characterized by: beam shape, more tightly, volume is small, the mould of feeding room is small, easy loading, less fiber damage in the process of production, and products can be directional laying stress mould plastics, high strength can be obtained from products, but the liquidity of molding compound and the mutual capacitance between beam material is a bit poor, production is lower than premixed method. And the immersion method can be divided into manual and mechanical method, commonly used in industrial production machinery presoak method. Manual presoak manual presoak method of fibre pretreatment, with glue and drying process requirements and premixed method basic same, but the fiber length is 600 ~ 800 mm, don't need a fluffy, glue liquid density control in 1. 00 ~ 1. 025 range. Soak glue with copper bar as rubber roller, with the hand drawing between fiber after two copper bar, drying of presoak material shear sealed in plastic bag into the required length. Mechanical process of presoak method is: fiber derived from the yarn by the cluster ring into the glue tank soak glue, glue liquid density control in 1. 00 ~ 1. 025, fiber drawing speed is 1. 2 to 1. 35 m/min, fiber to the first Ⅰ after densified by scraping the rubber roller, Ⅱ oven to dry. First grade Ⅰ oven temperature of 110 ~ 120 ℃, the first grade Ⅱ oven temperature is 150 ~ 160 ℃, drying of presoak material by traction roll leads into the cutting machine cut into the required length sealed in a plastic bag. Screw extruder extrusion method is used to produce glass fiber molding compound it overcome the premixed and presoak method using a large amount of organic solvent shortcomings, improve the labor hygiene condition, reduces the cost, product quality can uniformly stable and continuous and automatic production, the disadvantage is that fiber in the screw extruder frayed, and serious to be cut to reduce the strength of products, are not used in the production of epoxy fiber molding compound.