ABS modified plastic has good comprehensive properties
ABS modified plastic has good comprehensive properties
Abs has an oxygen index of only 18%, which burns easily. In order to meet the requirements of fire safety, flame retardant modification is required. All countries of the world have clear regulations on the fire retardant grade of abs modified by electronic and electrical products. The flame retardant level is generally required to reach UL94V level 0.
Car to the requirement of flame retardant ABS and alloy level is generally not high, not to join flame retardants can satisfy the use requirement, but for the car empty boxes and other special parts, it is best to use self-extinguishing fire retardant. At present, the flame retardant modification of ABS material is mainly used to add high-efficiency halogen flame retardant. The flame retardant ABS/PC alloy is mainly used for the more environmentally friendly phosphor flame retardant. ABS resin has good flame retardant performance, which is suitable for the high requirement of flame retardant grade, such as the car and the car shell, etc. Enhanced ABS mechanical properties, can replace metal, reduce the weight and manufacturing cost; The recovery of modified ABS is in accordance with relevant national regulations and policies, and has good prospects for development. GF reinforced ABS has good comprehensive performance, such as high strength, good rigidity, corrosion resistance, heat insulation, high temperature resistance, good formability, dimension stability, etc., forming, mould wear and tear is small, easy to recycle, so more common.
Under the condition of the same formula, blending equipment and blending process and molding process such as production conditions have great influence on the performance of the final product, such as mixing temperature, residence time, screw speed, extrusion production, injection temperature, mold temperature, will directly affect the performance of the final product. Mixing time and mixing temperature have significant influence on the shape of PC/ABS alloy. The mechanical properties that are affected by the co-mixing conditions are the impact strength of the alloy. The mixing temperature is too low, the material can not melt fully, the mixing effect is not good, so the impact strength is low. The mixing temperature is too high, some materials degrade and the impact strength is decreased.
PC/ABS resin best extrusion temperature is 210 ~ 230 ℃. The high screw speed is good for the mixing of materials, thus improving the impact strength of the alloy. The material is larger and the material shear force increases and the mixture of materials is also beneficial to the increase of alloy impact strength. The compatibility between PC and ABS can be greatly improved by the addition of solvent, thus improving the tensile strength and stress cracking property of the alloy.
