▎ 摘　　要

NOVELTY - Special plastic soft core comprises a first layer (1), a second layer (2), a third layer (3) and a fourth layer (4) arranged from outside to inside. The first layer comprises polypropylene resin, poly-4-methyl-1-pentene resin, polyisobutylene, polyamide resin, modified fluorosilicone oil, maleic anhydride compatibilizer, peroxidation initiator, graphene, talc, calcium carbonate, short glass fibers, antioxidant and polyethylene carbon black master batch. The second layer comprises thermoplastic polyester elastomer resin,polyamide resin, polyisobutylene, maleic anhydride compatibilizer, peroxidation initiator, calcium carbonate, antioxidant and polyethylene color master batch. The third layer comprises e.g. polypropylene resin, polyisobutylene, polyamide resin, talc, calcium carbonate, antioxidant and polyethylene color master batch. The fourth layer is a skeleton layer and the fourth layer is formed by a nylon rope and steel wire rope through a weaving process. USE - The special plastic soft core is useful for hydraulic rubber pipe production industry (claimed). ADVANTAGE - The plastic soft core has high temperature resistance, scratch resistance, heat aging resistance, medium oil resistance, small bending stress, easy core, stable size and has high precision. The method has low manufacturing cost; improves the control and efficiency of the inner diameter precision and has good market popularization value. DETAILED DESCRIPTION - Special plastic soft core comprises a first layer (1), a second layer (2), a third layer (3) and a fourth layer (4) arranged from outside to inside. The first layer comprises 20-40 pts. wt. polypropylene resin, 20-40 pts. wt. poly-4-methyl-1-pentene resin, 5-10 pts. wt. polyisobutylene, 5-20 pts. wt. polyamide resin, 0-1 pts. wt. modified fluorosilicone oil, 1-5 pts. wt. maleic anhydride compatibilizer, 0.10-0.5 pts. wt. peroxidation initiator, 1-5 pts. wt. graphene, 10-40 pts. wt. talc, 10-40 pts. wt. calcium carbonate, 0-5 pts. wt. short glass fibers, 1-3 pts. wt. antioxidant and 1-3 pts. wt. polyethylene carbon black master batch. The second layer comprises 50-80 pts. wt. thermoplastic polyester elastomer resin, 5-10 pts. wt. polyamide resin, 2-15 pts. wt. polyisobutylene, 1-5 pts. wt. maleic anhydride compatibilizer, 0.10-0.5 pts. wt. peroxidation initiator, 10-40 pts. wt. talc, 10-40 pts. wt. calcium carbonate, 1-3 pts. wt. antioxidant and 1-3 pts. wt. polyethylene color masterbatch. The third layer comprises 30-80 pts. wt. polypropylene resin, 2-10 pts. wt. polyisobutylene, 2-10 pts. wt. polyamide resin, 1-5 pts. wt. maleic anhydride compatibilizer, 0.10-0.5 pts. wt. peroxidation initiator, 30-50 pts. wt. talc, 30-50 pts. wt. calcium carbonate,1-3 pts. wt. antioxidant and 1-3 pts. wt. polyethylene color master batch. The fourth layer is a skeleton layer and the fourth layer is formed by a Kevlar(Heat-resistant, synthetic, lightweight fiber) fiber rope, a nylon rope and a steel wire rope through a weaving process. An INDEPENDENT CLAIM is also included for producing special plastic soft core comprising (a) forming the skeleton layer by using Kevlar(Heat-resistant, synthetic, lightweight fiber) fiber rope, nylon rope and steel wire rope through the weaving process, completing the preparation of the skeleton layer, (b) mixing, heating polypropylene resin, polyisobutylene, polyamide resin, maleic anhydride compatibilizer, peroxide initiator, talc, calcium carbonate, antioxidant and polyethylene-based color master batch, controlling the heating and internal mixing process time to be completed within 3 minutes to 8 minutes, controlling the temperature at 170-200℃, the length-diameter ratio of double screw between 20:1-45:1, setting the temperature to 185-210℃ of the barrel, setting the machine head at 195-230℃, operating cooling water and pelletizing as usual, drying at 85℃ for 1 hour, (c) mixing, heating thermoplastic polyester elastomer resin, polyamide resin, polyisobutylene, maleic anhydride compatibilizer, peroxide initiator, talc, calcium carbonate, antioxidant and polyethylene-based color masterbatch, controlling the heating and internal mixing process time to be completed within 3 minutes to 8 minutes, controlling the temperature at 170-200℃, the length-diameter ratio of the double screw between 20:1-45:1, setting the temperature at 185-210℃ for the barrel, setting the machine head at 195-230℃, operating cooling water and pelletizing as usual based on conventional operation, drying at 85℃ for 1 hour, (d) mixing, heating polypropylene resin, poly-4-methyl-1-pentene resin, polyisobutylene, polyamide resin, modified fluorosilicone oil, maleic anhydride compatibilizer, peroxide initiator, graphene, talc, calcium carbonate, short glass fibers, antioxidant and polyethylene-based carbon black masterbatch, controlling the heating and mixing time within 3 minutes to 8 minutes, controlling the temperature at 170-200℃, the length-diameter ratio of the double screw between 20:1-45:1, setting the temperature at 185-210℃ for the barrel, setting the machine head at 195-230℃, operating cooling water and pelletizing as usual based on conventional operation, drying at 85℃ for 1 hour and (e) placing the materials obtained from steps (a), (b), (c) and (d) into a constant tension device (1), a plastic extrusion device (2), a plastic extrusion device (3) and a plastic extrusion device(4), where the constant tension device (1) realizes constant tension control, the plastic extrusion device (2), a plastic extrusion device (3) and a plastic extrusion device(4), are plastic single-screw T-head extruders and starting continuous production process to prepare plastic soft core, controlling the tension of device (1) at 5-10 Kg, setting the temperature of devices (2), (3) and (4) to 185-210℃ of the barrel, setting the machine head at 195-230℃ and controlling the total traction speed at 5-15 m/minute. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the special plastic soft core for hydraulic rubber pipe production industry. 1First layer 2Second layer 3Third layer 4Fourth layer