Transparent light-shielding PVC (polyvinyl chloride) modified material for wires and cables and preparation method of PVC modified material

Abstract

The invention relates to the technical field of PVC modified materials, in particular to a transparent light-shielding PVC (polyvinyl chloride) modified material for wires and cables and a preparation method of the PVC modified material. The transparent light-shielding PVC modified material for wires and cables is prepared from raw materials in parts by weight as follows: 80-120 parts of PVC resin, 50-75 parts of a plasticizer, 5-15 parts of light calcium carbonate, 30-45 parts of heavy calcium carbonate, 15-25 parts of an opacifying agent, 4-8 parts of a heat stabilizer, 1-3 parts of an impact modifier, 0.6-1.0 part of a light shielding agent, 0.4-0.8 parts of an antioxidant, 0.6-1.0 parts of an outer lubricant and 0.3-0.7 parts of an inner lubricant. The transparent light-shielding PVC modified material for wires and cables has a good light shielding effect and better oxidation resistance and is environment-friendly, good in temperature resistance and weather fastness, high in strength, excellent in impact resistance, good in flame retardance and processing performance and excellent in comprehensive performance.

Description

Technical field [0001] The invention relates to the technical field of PVC modified materials, in particular to a transparent light-shielding PVC modified material for wires and cables and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is one of the earliest industrialized and widely used general thermoplastics. It has the advantages of light weight, high strength, insulation, flame retardant, corrosion resistance, excellent comprehensive performance, low price and wide raw material sources; but also There are the following shortcomings: 1. Poor toughness, easily brittle and cracked when impacted, so it cannot be used as a structural material. In addition, the brittleness of polyvinyl chloride is greatly affected by temperature. The lower limit of use for general PVC products is -15°C, soft The lower limit of the use of PVC is -30℃; 2. The thermal stability is poor. It starts to decompose HCl at 100℃, and decomposes more rapidly when it is hi...

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Problems solved by technology

[0002] Polyvinyl chloride (PVC) is one of the earliest industrialized and widely used general-purpose thermoplastics. It has light weight, high strength, insulation, flame retardancy, corrosion resistance, It has the advantages of excellent comprehensive performance, low price and wide source of raw materials; but it also has the following disadvantages: 1. Poor toughness, easy to be brittle when impacted, so it cannot be used as a structural material. In addition, the brittleness of polyvinyl chloride is greatly affected by temperature. Large, the lower limit of general PVC products is -15°C, and the lower limit of soft PVC is -30°C; 2. Poor thermal stability, it begins to decompose HCl at 100°C, and decomposes more rapidly when it is higher than 150°C. The melting temperature of PVC is about 210°C; 3. The viscosity of PVC is extremely high and its fluidity is extremely poor, which limits its use to a certain extent.

[0003] However, the existing PVC materials for cables have defects such as poor shading effect and poor anti-oxidation effect, which limit their use to a certain extent.