Patent ID: 11926725
Assignee: KINGFA SCI. & TECH. CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC C  B | IPC B  C

Claim 11:
12. A preparation method of the flame-retardant HIPS material according to claim 4, comprising the following steps:
step a, fully mixing raw materials of each component according to a ratio in a high-speed mixer for 3 minutes to 6 minutes to obtain a mixture;
step b, feeding the mixture into a twin-screw extruder through a precisely metered feeding device, with a temperature of each section of a extruder screw being controlled between 170° C. and 220° C., a length-to-diameter ratio of the twin-screw extruder being 30 to 35, and a rotating speed of the screw being 300 revolutions/minute to 800 revolutions/minute, fully melting and mixing the materials under shearing, mixing and conveying of the screw, and then through extrusion, granulation and drying to obtain a flame-retardant HIPS particle; and
step c, adding the flame-retardant HIPS particle to an injection machine to mold into a sample strip to be tested, under injection conditions that a barrel temperature is 185° C. to 220° C., an injection pressure is 40 MPa to 60 MPa, and a speed is 40 cm3/s to 70 cm3/s.