Non-halogen flame-retardant polyethylene sheath insulating material and preparation method thereof

Abstract

The invention relates to the field of insulating materials, in particular to a non-halogen flame-retardant polyethylene sheath insulating material and a preparation method thereof. The non-halogen flame-retardant polyethylene sheath insulating material is prepared from components as follows: LLDPE-7042 (linear low density polyethylene-7042), LDPE (low-density polyethylene), a silane coupling agent, a cross-linking agent DCP, an antioxidant 300 and a catalyst masterbatch, wherein the catalyst masterbatch comprises components as follows: LLDPE-7042, LLDPE-8320, PP (polypropylene), an antioxidant 1010, an antioxidant DLTP, an antioxidant 1024, organic tin, a fluororubber masterbatch and a non-halogen intumescent flame retardant. The material is mainly applied to an insulating layer of a cable and is mainly used for replacing a current PVC (polyvinyl chloride) material, the insulating property of the material is superior to that of PVC, and the silane insulating material is non-toxic and harmless while PVC can release toxic and harmful gas when a wire is on fire caused by aging and the like.

Description

technical field

[0001] The invention relates to the field of insulating materials, in particular to a halogen-free flame-retardant polyethylene sheath insulating material and a preparation method thereof. Background technique

[0002] The types of polyolefins used in the cable industry mainly include PE, PP, EVA and EEA, etc. Among them, the relatively large amount and long application history are mainly PE, which include HDPE, MDPE, LDPE, LLDPE and cross-linked XLPE. Their application Needless to say. The current application and development trends of polyolefins in the industry mainly focus on the following aspects:

[0003] (1) Serialization and perfection of halogen-free and low-smoke materials

[0004] Halogen-free, low-smoke, flame-retardant cable materials have been developing rapidly in recent years, and thermoplastic materials that meet the requirements of the IEC92-359 standard have been more and more widely used. With the requirements of cables for oil platforms...

Examples

Embodiment 1

[0044] A halogen-free flame-retardant polyethylene sheath insulating material, which is prepared from the following components by weight percentage:

[0045]

[0046] and catalyst masterbatch;

[0047] Described catalyst masterbatch is made of following component:

[0048]

[0049] The two-step method for preparing the above-mentioned halogen-free flame-retardant polyethylene sheath insulating material mainly consists of two parts, one is the preparation of the catalyst masterbatch, and the other is the preparation of the finished product.

[0050] 1. Catalyst masterbatch preparation:

[0051] Stir the above materials in the mixer, first stir at low speed for 1 minute and then at high speed for 3 minutes, then release and pour into the hopper of the extruder (extruder temperature: 140-180°C), extrude through the twin-screw, and then pass through the cooling water tank for cooling , and then blown dry by a fan before cutting into pellets. The pellets are dried in a dryi...

Embodiment 2

[0061] A halogen-free flame-retardant polyethylene sheath insulating material, which is prepared from the following components by weight percentage:

[0062]

[0063] and catalyst masterbatch;

[0064] Described catalyst masterbatch is made of following component:

[0065]

[0066]

[0067] The insulating material mentioned above was prepared by the two-step method of Example 1.

Embodiment 3

[0069] A halogen-free flame-retardant polyethylene sheath insulating material, which is prepared from the following components by weight percentage:

[0070]

[0071] and catalyst masterbatch;

[0072] Described catalyst masterbatch is made of following component:

[0073]

[0074] The one-step method for preparing the above-mentioned halogen-free flame-retardant polyethylene sheath insulating material mainly consists of two parts, one is the preparation of the catalyst masterbatch, and the other is the preparation of the finished product.

[0075] 1) Catalyst masterbatch preparation: Stir the above catalyst masterbatch materials in a mixer, first stir at low speed for 1 minute, then stir at high speed for 3 minutes, then release and pour into the hopper of the extruder. After the screw is extruded, it is cooled by the cooling water tank, and then dried by the fan before being pelletized. The pellets are dried in the drying tower at 80°C for more than 2 hours, and then ...

technical field

[0001] The invention relates to the field of insulating materials, in particular to a halogen-free flame-retardant polyethylene sheath insulating material and a preparation method thereof. Background technique

[0002] The types of polyolefins used in the cable industry mainly include PE, PP, EVA and EEA, etc. Among them, the relatively large amount and long application history are mainly PE, which include HDPE, MDPE, LDPE, LLDPE and cross-linked XLPE. Their application Needless to say. The current application and development trends of polyolefins in the industry mainly focus on the following aspects:

[0003] (1) Serialization and perfection of halogen-free and low-smoke materials

[0004] Halogen-free, low-smoke, flame-retardant cable materials have been developing rapidly in recent years, and thermoplastic materials that meet the requirements of the IEC92-359 standard have been more and more widely used. With the requirements of cables for oil platforms...

Examples

Embodiment 1

[0044] A halogen-free flame-retardant polyethylene sheath insulating material, which is prepared from the following components by weight percentage:

[0045]

[0046] and catalyst masterbatch;

[0047] Described catalyst masterbatch is made of following component:

[0048]

[0049] The two-step method for preparing the above-mentioned halogen-free flame-retardant polyethylene sheath insulating material mainly consists of two parts, one is the preparation of the catalyst masterbatch, and the other is the preparation of the finished product.

[0050] 1. Catalyst masterbatch preparation:

[0051] Stir the above materials in the mixer, first stir at low speed for 1 minute and then at high speed for 3 minutes, then release and pour into the hopper of the extruder (extruder temperature: 140-180°C), extrude through the twin-screw, and then pass through the cooling water tank for cooling , and then blown dry by a fan before cutting into pellets. The pellets are dried in a dryi...

Embodiment 2

[0061] A halogen-free flame-retardant polyethylene sheath insulating material, which is prepared from the following components by weight percentage:

[0062]

[0063] and catalyst masterbatch;

[0064] Described catalyst masterbatch is made of following component:

[0065]

[0066]

[0067] The insulating material mentioned above was prepared by the two-step method of Example 1.

Embodiment 3

[0069] A halogen-free flame-retardant polyethylene sheath insulating material, which is prepared from the following components by weight percentage:

[0070]

[0071] and catalyst masterbatch;

[0072] Described catalyst masterbatch is made of following component:

[0073]

[0074] The one-step method for preparing the above-mentioned halogen-free flame-retardant polyethylene sheath insulating material mainly consists of two parts, one is the preparation of the catalyst masterbatch, and the other is the preparation of the finished product.

[0075] 1) Catalyst masterbatch preparation: Stir the above catalyst masterbatch materials in a mixer, first stir at low speed for 1 minute, then stir at high speed for 3 minutes, then release and pour into the hopper of the extruder. After the screw is extruded, it is cooled by the cooling water tank, and then dried by the fan before being pelletized. The pellets are dried in the drying tower at 80°C for more than 2 hours, and then ...

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