Boiling-free silicane cross-linking polyolefin composition

Abstract

The invention provides a warm-water-free silane crosslinking polyolefines composition, comprising base material A and catalyst parent material B, the weight ratio thereof being :100:4-6, wherein the base material A is composed of (by weight parts): polyolefine rsin 100 parts, first antioxidant 0.2-0.3 parts, silicane 2.0-4.0 parts, initiator 0.1-1.0 parts, lubricant 1.0-3.0 parts, fatty acid 0.1-0.5 parts, the catalyst parent material B is composed of (by weight parts): polyolefine resin 100 parts, second antioxidant 1.0-5.0 parts, catalyst 2.0-5.0 parts, ester compound 2.0-5.0 parts, metal oxide 2.0-5.0 parts. The preparation method is uniformly mixing the above material. The silane crosslinking polyolefines composition can be linkable under natural conditions not through boiling or vapor bathing, with property corresponding the operational requirement, especially silane crosslinking polyolefines cable material .

Description

technical field [0001] The invention relates to a cross-linked polyolefin composition and a preparation method thereof, in particular to a silane-crosslinked polyolefin cable material which can be cross-linked under natural conditions without being boiled or steamed in a steam bath and a preparation method thereof . In the process of preparing silane-crosslinked polyolefins, using an autocatalytic cross-linking system comprising ester compounds, fatty acids, organotin compounds and metal oxides, cross-linked polyolefins can be obtained without boiling or steam bathing. Olefins. The composition is mainly used in the production of low-voltage (below 10kV) wires and cables. Background technique [0002] Three crosslinking techniques are commonly used for crosslinking polyolefin compositions, namely peroxide crosslinking, radiation crosslinking, and silane crosslinking. Among these three technologies, the silane crosslinking method is commonly used in the production of low-vo...

AI Technical Summary

Problems solved by technology

The above-mentioned patents have more or less deficiencies in the actual application of the production of silane-crosslinked polyolefins: although some can be cross-linked at room temperature, the water required for hydrolysis of silane-grafted polyethylene is completely diffused and infiltrated from the outside. The cross-linking efficiency is still not high; some use free radical-terminated antioxidants in the preparation of silane-grafted polyethylene, which will inevitably affect the initiation efficiency of peroxides, and some simply do not use antioxidants. When polyethylene is melted and grafted at high temperature, it will cause strong degradation of polyethylene; even some catalytic systems are weak in self-catalysis, and need to be placed in the natural environment for a long time to slowly cross-link

In addition, improper selection or compounding of the base resin will also lead to insufficient crosslinking degree of the final product. These are all problems to be solved when the above invention is applied to actual industrial production

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