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Halogen-free flame-retardant thermoplastic polyurethane cable material and preparation method thereof

A thermoplastic polyurethane and cable material technology, applied in the field of cable materials, can solve problems such as deterioration of mechanical properties and flame retardant properties, agglomeration of flame retardants, long storage time, etc., to achieve improved mechanical properties, stable performance, and control of operation and time convenient effect

Pending Publication Date: 2022-03-25
会通新材料(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, since isocyanate prepolymers are usually pastes and have extremely high activity, they need to be preheated and added when premixed with other raw materials. If the moisture content of other raw materials is not well controlled, or the storage time after mixing is too long, not only It can't play the role of strengthening, but it may solidify in advance, causing the flame retardant to agglomerate, and seriously deteriorating the mechanical properties and flame retardant properties

Method used

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  • Halogen-free flame-retardant thermoplastic polyurethane cable material and preparation method thereof
  • Halogen-free flame-retardant thermoplastic polyurethane cable material and preparation method thereof
  • Halogen-free flame-retardant thermoplastic polyurethane cable material and preparation method thereof

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preparation example Construction

[0035] Its preparation method comprises the following steps:

[0036] S1. Preparation of blocked isocyanate prepolymer: polymerize diisocyanate and macromolecular diol at a temperature of 80-120°C, add blocking agent after polymerization, fully react, filter and dry to obtain blocked isocyanate prepolymer , Preheat the blocked isocyanate prepolymer at 45-55°C for 30-50min;

[0037] S2. Drying of raw materials: drying the thermoplastic polyurethane resin, flame retardant, antioxidant and light stabilizer in an oven at 90-110°C until the moisture content is lower than 0.02%;

[0038] S3. Mixing materials: add the preheated blocked isocyanate prepolymer in step S1 and the dried materials in step S2 to the high-speed mixer in sequence according to parts by weight, mix for 3-5 minutes, and mix evenly to obtain a mixed material;

[0039] S4. Extrusion granulation: Extrude the mixture with a twin-screw extruder, the temperature of the twin-screws is 170-190°C, and granulate by cutti...

Embodiment 1

[0046] Firstly, the blocked isocyanate prepolymer is prepared by polymerizing 2,2'-diphenylmethane diisocyanate and polyoxypropylene diol at a molar ratio of 1.3:1 at a temperature of 80°C, adding The dibutyltin dilaurate of polymer gross weight 2%, add the phenol that accounts for polymer gross weight 8% wherein to it after polymerization is completed, fully react, obtain the blocked type isocyanate prepolymer of blocking rate 95%, block type isocyanate The prepolymer was preheated at 50°C for 40 minutes.

[0047] Place the raw materials in an oven at 90°C and dry until the moisture content is lower than 0.02%. Weigh 60 parts of thermoplastic polyurethane, 20 parts of aluminum diethylphosphinate, and 7.5 parts of bisphenol A-bis(diphenyl phosphate ), 5 parts of montmorillonite, 0.5 parts of antioxidant 1010, and 0.5 parts of light stabilizer Tinuvin 234 were put into a high-speed mixer for premixing for 3 minutes, and 1 part of preheated blocked isocyanate prepolymer was weig...

Embodiment 2

[0049] Firstly, the blocked isocyanate prepolymer is prepared by polymerizing 2,2'-diphenylmethane diisocyanate and polyoxypropylene diol at a molar ratio of 1.5:1 at a temperature of 100°C, adding The dibutyltin dilaurate of polymer gross weight 1%, adds the phenol that accounts for polymer gross weight 5% wherein to it after polymerization is completed, fully reacts, obtains the blocked type isocyanate prepolymer of sealing rate 92%, will blocked type isocyanate The prepolymer was preheated at 45°C for 50 minutes.

[0050] Place the raw materials in an oven at 100°C and dry until the moisture is lower than 0.02%, weigh 70 parts of thermoplastic polyurethane, 15 parts of aluminum diethylphosphinate, 10 parts of bisphenol A-bis(diphenyl phosphate ), 10 parts of montmorillonite, 1.2 parts of antioxidant 1010, and 0.8 parts of light stabilizer Tinuvin 234 were put into a high-speed mixer for premixing for 3 minutes, and 5 parts of preheated blocked isocyanate prepolymers were we...

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Abstract

The invention discloses a halogen-free flame-retardant thermoplastic polyurethane cable material. The cable material is prepared from the following component raw materials in parts by weight: 60-80 parts of thermoplastic polyurethane resin, 10-40 parts of a flame retardant, 1-10 parts of a blocked isocyanate prepolymer, 0.5-2 parts of an antioxidant and 0.5-1 part of a light stabilizer. According to the invention, when the temperature is lower than the unblocking temperature, isocyanate does not react with water or other hydroxyl groups, so that the long-time stability of isocyanate is ensured in the mixing and extruding processes, a prepolymer is rapidly unblocked under the action of temperature during extrusion in a twin-screw, and isocyanate reacts with polyurethane and other fillers, so that the sealing performance of the polyurethane is improved, and the service life of the polyurethane is prolonged. While the mechanical property is improved, the dispersity of other fillers is also facilitated. According to the invention, the operability of the premix is effectively improved, so that the product quality is ensured, and the preparation method has the advantages that the operation and time control are more convenient, the performance is more stable, and the mechanical property of the polyurethane cable material is obviously improved.

Description

technical field [0001] This patent application relates to the technical field of cable materials, in particular to a halogen-free flame-retardant thermoplastic polyurethane cable material and a preparation method thereof. Background technique [0002] Polyurethane is a high molecular polymer polymerized by diisocyanate, macromolecular diol and chain extender. Generally, polyurethane can be divided into polyester type and polyether type according to the type of diol. Polyether polyurethane is more difficult to be hydrolyzed in hot water environment, so it has been widely used in the field of cables. [0003] Compared with polyolefin cable sheaths for other sheaths, thermoplastic polyurethane has very superior tensile strength, elongation at break and abrasion resistance, low temperature flexibility, oil resistance, and aging resistance are also very prominent, so it is widely used in electric power Cables, communication cables, automotive cables, industrial cables and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/04C08L75/08C08K5/5313C08K5/523C08K3/34C08K5/3492
CPCC08L75/04C08L2203/202C08L2201/02C08L2201/22C08L75/08C08K5/5313C08K5/523C08K3/346C08K5/34928
Inventor 朱树琦孙刚伟
Owner 会通新材料(上海)有限公司
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