BMC Research On Breaker And Related Low Voltage Equipment

Bulk Molding Compound(BMC)is a very important product of unsaturated polyester resin in molding compound.BMC is made of unsaturated polyester resin,organic additives,initiator,powder filler,thickener and long cut or chopped glass fiber and other components of the mixture of thermosetting composite materials.BMC with low cost,good technology,high strength characteristics in the automotive,electrical,household appliances and other industrial products on a wide range of applications.This paper focuses on the realization of BMC recipe adjustment to replace the imported unsaturated polyester resin,while improving the material strength and to a certain extent,decrease the curing time,the proportion of long material,focusing on providing circuit breakers and other electrical switches BMC material products solutions.By participating in the design and development of new unsaturated polyester resin to replace the current import of unsaturated polyester resin,to achieve the cost reduction,improve product competitiveness.High-breaking circuit breaker switch on the material demand for good appearance,high strength,and low cost requirements,we use the new unsaturated polyester resin and by adjusting the ratio of different resins,fillers and additives to determine the circuit breaker Switching properties of the material formulation.In the process of material formulation verification,the material forming processability is met and the following four problems are solved:1)The use of homemade unsaturated polyester resin B instead of imported unsaturated polyester resin A for formulation customization,to achieve cost savings.2)To improve the BMC material strength,including tensile strength,flexural strength and impact strength.3)Ensuring the premise of high strength while ensuring low-density,and to a certain extent reduce the curing time and improve production efficiency4)Combined with the requirements of circuit breakers and products,the development of test programs and the practical application of materials to verify.By analyzing the effect of each component on the properties of materials,adjusting the group distribution ratio and obtaining various solutions,combined with product characteristics,greatly improved the comprehensive performance of switch products,and effectively reduce the cost,and finally determine the proportion of homemade unsaturated polyester resin B at 18.3%,with a low shrinkage agent ratio of 6%,with an initiator ratio of 0.5%,and a determination of the proportions of other components such as filler and glass to form the final formulation and preparation of the material,and then finalizing the finished product and The mechanical testing of products and electrical short-circuit test,the final successful mass production and bring nearly a million cost savings,while improving the BMC material formula adjustment has important guiding significance.