Abstract: A microspheric ionomer having a cross-linked structure, a preparation method therefor, applications thereof, and a preparation system thereof. The ionomer comprises structure units A represented by formula (1), structure units B represented by formula (2), and a cross-linking structure provided by a cross-linking agent, M being separately selected from H, a metal cation, and a straight chain, a saturated alkyl of branched or ring-shaped C1-C20, R being H or a methyl; and metal cations are introduced to part of structure units A in the ionomer. The ionomer shows an outstanding effect on nucleation of PET, serves as a nucleating agent for PET modification, so as to obtain a corresponding PET composition.

Abstract: A drill bit for cutting formation comprises a bit body, a plurality of cutters, a plurality of blades with pockets to accommodate the cutters respectively. Each of the plurality of cutters has an ultra-hard layer, two side facets extending obliquely inward from the substrate to a top surface of the ultra-hard layer, a convex portion between the two side facets. The convex portion comprises a transition surface and the transitional surface is convex as it extends between adjacent the two side facets. The curvature of the transitional surface varies along the cutter axis with the curvature at the cutting edge larger than the curvature of the cutter circumferential surface.

Abstract: The present utility model relates to the field of drill stem safeguard. Specifically, the present utility model relates to a kind of screw thread safeguard of drill stem. In order to overcome the disadvantages of the modern drill stem safeguard that it is difficult to be installed or disassembled and falls off easily, its house may separate from the plastic component, and the screw thread of the drill stem may be damnified easily. the object of the utility model is to provide a screw thread safeguard of the drill stem, which comprises an inner loop and an outer loop. The detailed structure is stated in the description. The screw thread safeguard of the drill stem in the present utility model can be installed and disassembled simply. And it doesn't fall off generally. Its house will not separate from the plastic component easily, and it can protect the screw thread from damnification.

Abstract: The present utility model relates to the field of the baling equipment for tubular goods. Specifically it relates to a kind of baling bracket. The present utility model provides a baling bracket, including a keel, a stem with screw thread, a bracket, a washer, and skidproof veins. The bracket and washer are connected in series with the keel, whose two ends are nested on the stem with screw thread. One side of the bracket is wider and the other is narrower, and two narrower sides of the brackets are connected to form a groove, which has the skidproof veins. The present utility model is low-cost, convenient and will not part and disperse packages easily. It can be applied to tubular goods of various models.