Low-warpage reinforced polycarbonate alloy and preparation method thereof

Abstract

The invention relates to low-warpage reinforced polycarbonate alloy and a preparation method thereof. The low-warpage reinforced polycarbonate alloy is prepared from the following raw materials in parts by weight: 55-85 parts of matrix resin, 10-40 parts of ground glass and 0.1-5 parts of other components. The preparation method comprises the following steps: preparing the raw materials according to a formula, mixing the matrix resin with the other components in a medium-speed mixer for 20 minutes, adding a mixture into a double-screw extruder from a main feeding hole, individually adding the ground glass into the double-screw extruder from a side feeding hole according to the formula proportion, melting and extruding the raw materials in the double-screw extruder, and granulating to prepare the low-warpage reinforced polycarbonate alloy. Compared with the prior art, the preparation method has the advantages that high warpage of reinforced polycarbonate is improved on the premise of reducing the material cost, and low-warpage reinforced resin is obtained by the characteristic that horizontal and longitudinal shrinkage ratios are different as the ground glass cannot be oriented in the flowing direction during formation.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a low warpage reinforced polycarbonate alloy and a preparation method thereof. Background technique [0002] With the development of the plastic industry, ordinary engineering plastics cannot fully meet the strength requirements of customers, so reinforced plastic alloys have emerged, such as glass fiber reinforced materials, talcum powder reinforced materials, wollastonite reinforced materials, etc. . However, glass fiber and wollastonite tend to be oriented along the direction of fluidity during the injection molding process, resulting in inhomogeneity in the horizontal and vertical directions of the material, and inconsistent shrinkage during the cooling process, resulting in warping of the material. Although talcum powder has no anisotropy, its strength is not as good as that of glass fiber, and it is usually alkaline, which easily degrades some materials, such as polycarbonate menti...

AI Technical Summary

Problems solved by technology

Once the polycarbonate material degrades, it will cause a huge loss of toughness, which will affect its use

[0003] Usually the parts that need to increase rigidity are large or ultra-thin products, because the larger and thinner the product, the more difficult it is to support its shape through the structure. Some manufacturers will use steel sheets or magnesium-aluminum alloy support structures in product design, but in this way It will cause a huge waste of cost, so reinforcement materials are often used for injection molding

However, since the material will be warped and deformed after molding, these deformations will affect the subsequent assembly and introduce a large amount of internal stress, which will affect the appearance and even performance of the material.

Some slight deformations can be adjusted through the processing technology, while some larger deformations must be shaped to obtain higher flatness, which greatly increases the molding cycle, reduces the product yield, and also increases the process cost. is a last resort

[0004] The Chinese patent with the application number 200910197243.8 discloses a low warpage and high surface gloss glass fiber reinforced polyester composite material and its preparation method. The raw materials are polycarbonate, polyethylene terephthalate, toughening agent, kaolin, glass fibers, processing aids, etc., this patent discloses a material that improves glass fiber orientation by adding amorphous PC to reduce the crystallinity of PBT, and this patent is aimed at the PC system. In this system, if a large amount of high-flow The crystalline material improves the warpage, but the toughness of PC is largely lost

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