Assistant composition for rotational molding resin, linear medium density polyethylene composition and polyethylene rotational molding product

Abstract

The invention discloses an assistant composition for rotational molding resin, a linear medium density polyethylene composition and a polyethylene rotational molding product. Based on the total weight, the assistant composition comprises the following components: 3-12 wt% of a main antioxidant I; 5-23 wt% of a main antioxidant II; 5-25 wt% of an auxiliary antioxidant; 3-15% by weight of an external lubricant; 3-15 wt% of an antistatic agent; 10-25 wt% of an ultraviolet light stabilizer A; 5-15 wt% of an ultraviolet light stabilizer B; 5-15 wt% of an ultraviolet light stabilizer C; 3-10wt% of acompatibility enhancer; wherein the main antioxidant I is selected from hindered phenol antioxidants with trident skeleton structures, and the main antioxidant II is selected from at least one of hindered phenol antioxidants with straight-chain alkyl or straight-chain ester groups. The linear medium density polyethylene composition using the assistant composition breaks through a knee bending trap at 240 DEG C, the UV grade reaches 8 or above, and the rotational molding processing time and temperature window are greatly broadened.

Description

Technical field[0001]The invention relates to the field of polyethylene rotomolding molding, in particular to an auxiliary composition used for rotomolding resin, a linear medium density polyethylene composition and a polyethylene rotomolding product.Background technique[0002]Rotational molding is a very unique processing method, with low investment in equipment and molds, flexible technology, almost no internal stress, no deformation, no joints, and high strength. It is suitable for various large and complex shaped hollow plastic products. produce.[0003]The existing domestic rotomolding process is generally extensive, and most of them are directly heated by liquefied gas flame. The control accuracy of heating temperature, heating time, rotation speed, etc. is not high, and it is difficult to avoid high local temperature or overall temperature, reaching 240 degrees Celsius , The problem of low-temperature embrittlement of rotomolding products occurs, which is the so-called "knee-ben...

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Problems solved by technology

[0007] Although the rotomolding resins of the prior art have obtained better processability and aging resistance, there is still the problem of "bending knee trap" at 240°C, and the comprehensive balance performance of the rotomolding resins of the prior art is not good, and the UV level is common It can't reach level 8 or above, and it's all below level 6, which affects the long-term service life of the outdoor. These problems have long plagued the choice of raw materials in the rotational molding industry.

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